We try to avoid I-4 whether traveling in the car or RV. It's about as bad as I've seen it in the 20+ years we've lived in the Orlando area. 417 is a MUCH nicer ride. Worth every penny of the tolls. We have a Sunpass.
That said we did take I-4 west through Orlando about 2 weeks ago with the RV. Not sure what we were thinking. Hadn't been on it in awhile and didn't realize just how bad the construction and road surface was. Rattled the coach bad, and broke a fridge door bin.