Compare and Contrast
Along with using a good solid tripod, shooting with slide film is almost a requirement for truly learning how to take good images. It forces you to learn about exposure. Negative film is much too forgiving of your mistakes and masks way too many problems. Learning about exposure enables you to be in control of what your results will look like.
Another secret about slide film versus print film is the exposure latitude each provides: while print film affords you 8 or more stops of exposure between black and white, slide film is typically more like 4 to 5 stops. While, this does make getting "workable" exposures more tricky, the resulting photos will have much more apparent contrast, which translates into more dramatic results.
Take the plunge; it's worth it. If you're interested, I highly recommend John Shaw's books for learning about exposure.