I'm with Tomphot on this one. Getting up gives me an excuse to move around without wandering aimlessly about the cabin. The only time I'll use the button is if I'm in a window seat and my getting up would disturb passenger(s) between me and the aisle, if there's stuff on my tray table that would be difficult to get out of the way, or if the seatbelt sign is on. That's not because I don't want to ask FAs for anything, though. I really do prefer to get up.