Like crimsontider, I'm a 'real' musician using FL Studio. And I'm loving it. No other DAW just comes close to the snappy FL Studio experience. But that's just my opinion, of course. Your mileage may vary
And with 'real' musician I mean that I play guitars, bass and I do some singing. And a bit of piano. And some banjo. I just don't record a lot, but when I do I really like how FL Studio works. It's different from 'real' multitrackers, sure, but for now I haven't felt the need for using other products
My main genres are jazz and folkrock, but every now and then I'll experiment and venture into the world of orchestral compositions.
I use very few patterns. I only make patterns for stuff like the intro, verses, choruses and bridges. Just the separate parts in a song, basically. I used to make a ton of patterns, but when I started working on a big composition I quickly got over 50 unique patterns, and that just made me go crazy. Going with as little patterns as possible allows for a much better organisation, in my opinion. I might not work how FL Studio was designed to be worked with, but that's alright with me