I use larger cymbals because I like the sound of them better than smaller cymbals. Always have, and I like all the different sounds I can get out of them.
I have a few 21's I really like, and quite a few 20's. My favorite ride size is a 24.
Larger hats too, but for what I am doing these days, anything over 15 wouldn't work that great for me.
My smallest crash is a 19, but I use all my cymbals as a "cymbal" not as "just" a crash or ride, or whatever designation is stamped on it.
Right now, I'm using 3 cymbals on my kit. A 20", a 22" and a 24" (15" hats).
I originally wanted to just have 2 cymbals, but the 22 really sounds great, so I'm using it too, & the 22 might be swapped out once in a while with a 21" Sabian HH "Novo" style prototype cymbal I have. That's a cool one too.
I just feel freer, and more comfortable with fewer cymbals on the kit than I had been playing for years. But I still like my gong.
I like the sound of smaller cymbals when other people play them, but they really don't do anything for me when I play them.