Have had a 3D TV for a while. There is a lack of content at the moment and some of the content/conversions are dire, when done properly I (e.g Avatar) think it is fantastic, some sports are also pretty good in 3D.
Not sure if it will be a fad or become mainstream but BBC are going to broadcast Wimbledon finals in 3D and ITV have also been doing trials.
As for being “sucked” into buying a 3D TV, if at the end of the day it is a passing fad then I will still have a TV that gives me a superb HD picture. Price wise 3D TVs are not really that bad, I actually paid less for this TV than my firat large plasma screen (7 years ago).
As for GT5 in 3D I actually found this rather distracting and now stick to 2D for games.