I personally do, I buy 10-12 games a year. Most games need to be installed and a lot are massive, Knack: 35.6GB, Battlefield 4: 33.9GB,Killzone Shadow Fall: 38.5GB (full list: http://www.eurogamer.net/articles/2013-11-13-all-the-ps4-launch-games-and-their-install-sizes). Once you throw in the PS+ games, saved game data, that 500gb isn't looking all that big. I'm certainly going to use it all within the first 15 months.
I'd rather do it now and get it out of the way then a year down the line when I have to mess about transferring saved data and that. It should have came with 1tb as standard imo.
After doing a bit of research, I've come across 2TB Samsung Spinpoint M9T. Shame it's not out yet though, seems like it's almost built for the sole purpose of upgrading the PS4[h=2][/h]