I suppose one should at least have some familiarity with using a plectrum, on the off chance that it comes up someday. I play bass, and use my fingers almost exclusively. The trumpet player in the jazz band I used to play in once said something about how all "real" bassists use their fingers, and I said that in my opinion, REAL bassists use whatever the song requires. Sometimes the song requires a pick (or at least a VERY consistent clicky tone that you MIGHT be able to get with one finger if you use a bit of nail). Ukulele songs, as far as I know, mostly use fingers for strumming, but it's conceivable that a pick might be required. Having said that, I pretty much NEVER use them, although I do have a couple of different types of felt ukulele picks. I'm kind of curious about the leather picks made by Kiwaya. I doubt I would ever use one of those really either, though! Still, to be well-rounded, I do believe it doesn't hurt to know how (and when) to use a pick.