No, you don't need a baitcaster, but think of it as a new way to fish. I hate the line twist associated with spinning reels and yes, even with high quality swivels, I still get them. The only lures I use spinning gear for are drop shots, small rooster tails and size 5 or smaller rapalas.
Once you get the hang of baitcasting you should try fly fishing. At least you don't have to worry about a birdsnest with the fly rod.