Its been enough for me up until this year. Ive always had a 16gb iPhone and last year I got the 16gb ipad. Around January was when I noticed I had only 1.6 or so gb left. I didnt even realize I had put that many apps on the pad. I was just surfing through my settings and saw it. Before folders existed I was obsessed with only having Apps I actually used and didnt want lame apps on my iPad. After folders, I became less obsessed and downloaded like crazy.
So earlier this month with the iPad 2, I had to decide. Go 16 and start up my obsession again or go 32 and continue to download like a crazy man. I decided to go the unhealthy route and and continue my obsession. Got a 16 again. Other than apps, I just dont do enough to need 32 gigs.
Mind you now, I dont put any music(Pandora, VEVO, and TuneIn Radio get most of my music time) or buy any movies. I RENT(cause I dont like watching movies twice, plus I have NETFLIX)mostly NON HD movies which means I only need a couple gigs free to do so. If I had 32 gigs of space, I would have WAAAAY too many apps that were worthless on my iPad and that would SERIOUSLY get on my nerves.