When I first started commuting I was on the MUP for maybe 25% of the trip. Now I take the street or road that the MUP runs along so I am 100% on the roads or streets.

My reason is that the MUP is full of walkers, runners, dog walkers, kids in strollers and they slowed me down way to much. My confidence to ride on busy roads also increased over time so that I didn't need the perceived safety of the MUP.