Well those pictures must be deceiving, coz they sure as heck weren't smooth yesterday. They were either full of rocks or full of mud. They had gone over most of the trail with a bobcat fairly recently and moved a lot of the fallen logs and big washed out rocks out of the way, but that just left the loose dirt, and it apparently came a pretty good downpour out there on Saturday afternoon, so it was pretty sloppy in a lot of places. But to their credit, they did manage to get rid of a lot of the big suck mud pits by dozing it out and cutting drainage chutes across them.
I can see on some of the pics that the trails are nice and smooth in places... But I also see a lot of tough obstacles, down the hill, and the fallen trees. In our woods, the prison crews would have smoothed out and graveled those, and they go through the mud holes and add drainage underneath, bridges and culverts, and lots of rock and gravel :~D It's nice, when there's a correctional facility in the forest and a lot of cheap labor! That's why we have all the nicely over-maintained trails, it wouldn't be that way naturally.
The Backcountry Horsemen chapters also each adopt trails and go through in the spring cutting back brush and doing lighter maintenance. ecurbh and I will get around to joining one of those eventually.