I just started again and have been riding a 5mi MUP loop in a local park. One, it's easy riding to get back to basic shape, and two, I'm in such bad shape, not having to deal with traffic is actually nice. I'm starting to get bored with it, but there is an appeal to a nice route that allows for a mind freeing escape in the saddle.
There is value to a comfortable loop for general fitness and unwinding rides.
Oh and I drive to ride to get to the MUP as there are no convenient local loops without irritatingly bad cycling + traffic connecting routes involved, some of which are two lanes that people can't seem to stay within in their cars without a cyclist on the road.