Depends. What are you trying to edit?
If you're editing vocals or bass, then Elastic Audio, rendering using the X-form algorithm, is astoundingly intuitive and fast - much better than slipping for me. The rendering can take a little while on current CPUs but the actual workflow is second to none.
For drums you've got beat detective, and for anything that you have to get intense with you've got tab to transient, quantization and 'regular' slip editing.
One really cool thing about ProTools for me, as far as editing is concerned, is that the UI is so much more pleasant and readable than any other DAW I've used. You can tell most of the time where the transient is... and even when you can't, tab to transient will help you find it most of the time. Half the time I'm slipping in Cubase its mostly guess-work looking at those fugly non-anti-aliased waveforms.
Auto-fades would be really handy though.