Virtually all use it. Thing is that you can use it in different ways, most use it much more moderately and often just for additional tone selection. Jimi made it a feature of his playing, that would be frowned on a bit these days unless trying to create the authentic sound of the era.
Kirk Hammet loves his Wah-Wah, loads of funk and disco music use it (theme from Shaft is a great example), Stevir Ray Vaughan used it (Say What)....loads of examples