My only problem with the 15 minute abilities is waiting 15 minutes to be able to use it after switching job. Every time I'd help someone with something I'd switch over, travel to wherever place I need to be, and there's still 10 minutes to go. It took me quite some time to even have an opportunity to use Hundred Fists (PGL is my only level 50). The rest of the time, like in dungeons, I generally felt it was either overkill or just a suicide button with no middle ground.

To not have to endure the full cooldown on job switch would be nice, maybe just 7.5 minutes or so so you can't simply rotate the abilities in a dungeon or something.