I do it as often as I can. Wish people wouldn't treat it as if it was the equivelant of a shuttle launch! ......especially if you go by the FCOM procedures on single engine taxy. My reasons are:-
1) Great EFP (overtime builder)
2) Saving wear and fuel on the engine
3) You hardly have to use the brakes saving on wear
4) Just doing my bit for the environment, small maybe but after watching Al Gores "An Inconvinent Truth" he states every bit helps.