As I said in the F Maj thread that's the solution too the tricky chord. Also like I said when I started using alternate tunings it was huge for my growth. First it changed a lot of fundamentals for me, it got me from thinking chords, notes by name, and the same scales on the neck and started me really thinking in intervals. You can memorize scales in a tuning pretty easy and only be concerned with the root for what position you're playing it in. But when you switch up your tunings I find that if I think in intervals and concentrate on hearing the scale and not watching (for lack of a better word) the scale I can switch between tunings without a lot of 'relearning' the neck. (it stopped me from being a pentatonic addict)
Another thing about alternate tunings that I really like is how I use them with my guitars, my 24 fret guitars for the most part are tuned to tunings that start with a D instead of an E. I think with the extra range of the 24 fret neck you gain more tone by tuning lower and taking advantage of that little bit of extra range on the lower side and not on the higher notes gives some great tonal options.
Back to the F Maj thing, dont want to learn a whole lot of different tunings? Drop standard by a step, standard has some nice open chords, drop down a step and you have twice as many..literally an F is the same thing as G in standard and a nice full chord (my audio example was actually in the Am tuning) and of course the same holds true with the other open chords, that low D is pretty cool. Now I am talking all the strings one step down, not drop D tuning. I have one guitar tuned down F#m which is pretty low on a six string, but it's kind of cool and I can really get into it's gritty sound and it plays nicely with the baritone in some tunings.
My two favorite tunings are Am (EAEACE) and Gm one step lower, both are cross note tunings which means it's simple to jump to the major. What would be the B string in standard tuning is the only difference and of course all you need to do is use one finger, 1/2 step to go to the major. I find Open G to be a fairly bright tuning for example, but if I tune it to the minor it gets a little darker with an easy jump to major (on a hardtail it can be done on the fly with extreme ease). I have used many tunings though like DADGAD, modified that to DGDGAD for one little piece that I have never done anything with.
https://soundcloud.com/hink/accoustic
In another song of mine I had just recorded some acoustic parts in DADGAD and tried tuning the A to G and that just came out.
When I play my baritone or bass all bets are off when it comes to tunings, I am currently trying to learn to write my own type of string quartet (way outside of the norm for me so this will take a while but it's a great learning experience) Bass guitar, Baritone guitar, Acoustic guitar and Lead guitar. Of course that means at least three different tunings but I am going for 4. Bass is whatever tuning is easiest, bass tuning will often be the same as the key of the song.
IMVHO I think that alternate tunings are a great way to get out of a rut, sometimes picking around in unique tuning can be a lot of fun, D7 (DADF#CD) is a cool slide tuning and not as commonly used as Open G, A or E. Alternate can also change the feel of a song because of how the passage is played (like with hammer-ons and the open note in between the other notes).
I could write a lot more but what about others..alternate tunings...yay/nay? (some people have accused me of cheating using alternate tunings)
Take open G seeing how you brought it up and works, it's the one finger chords that some people just assume that I can't really play guitar because I am playing one finger chords (of course I played in standard only for a couple of decades). But the truth is for me that gives me a better jumping off point to go into a fill or whatever. Who thinks that's cheating? The same ones that think a capo is cheating too 
because I realize it is 
bloody session musos!
