Agreed. That's why I won't ride MUPs - I'm impatient and like to ride fast, so I'd be tempted to be the person you described. Instead, I stay on the road where speed isn't an issue.
I'm with you on that. Here in Tucson, Az we have a lot of MUP and building more. One section of a favorite path is really to dangerous for fast roadys like me any more. After a frustrating ride one day avoiding, stopping and slowing down for walkers, runners, skaters, strollers, dogs and other critters all going different speeds all over the path, I decided the bike lane on River Road was safer. I was right and now enjoy fast rides past that busy section of the Path riding next to car traffic which, for the most part, is more consistent and predictable.
An added note of frustration
when riding a MUP is the many walkers, runners and skaters wearing headphones and unable to hear you when you announce your approach. But I am glad to see the many people out enjoying healthy activity.
And indead we can all get along if I stay off the Multi Use Path
