I ride roads and MUPs, depending on where I'm going and who I'm with. However, Minneapolis has some of the best MUPs in the US, and with so much bike traffic, everybody understands the rules of the MUP.

Here's the Cedar Trail (best in class), one lane for eastbound bikes (Lisa is on this lane), to the left you see a rider on the westbound bike lane, and hard to see in the distance on the right is the trail for foot traffic in both directions:



Here is the Midtown Greenway, picture of the yeti at the Winter Bike Expo. You'll see three stripped lanes, eastbound bikes, westbound bikes, and foot traffic.



Here is the typical MUP in town, mixed use eastbound and westbound:



edit - after thought, I've been biking long enough to remember when people around here would piss themselves when you sounded a bell or announced "passing". This almost never happens any more, the typical response to sounding your bell is a person on foot will lift their left hand to signal that they heard you, I will normally say 'thank you' as I pass. People do get used to it, it just takes time and respect.