I don't. I completely understand why some prefer not to use them (MUPs: "multi-use paths" or 'trails'), but provided one accepts the inevitable restrictions, what's not to like?

Ours (typical views):


Three main spokes following branches of the river, plus connector sections. Each main spoke constitutes roughly a 20km out 'n back; put them together with some connectors and one has a decent ride, and the ability to extend from any spoke-end onto decent rural roads.