Yeah based on comments on this forum, if I rode a wide board with my size 8 feet it'd be unrideable!
Well I bought a 166 Nitro Slash for the fun of it, and it's 26.7 cm wide or so at the waist. Got it cheap so figured I'd try it, and it's a lot of fun! Very surfy, and I can turn it through the trees no problem.
I wouldn't get a wide if you don't need one, for all the reasons listed above, but it's not impossible to ride, that's for sure.