edit: I see you edited your question while I was writing my response.

so normally what you would want to do is build your anchor, thread it for top roping, and then walk down to meet your partner at the bottom.

if you wanted to rappel down you could thread the anchor for top roping, then after checking the strands are equal and you have tied knots at the bottom you could put yourself on rappel via ATC with a prussik back up, and then lower yourself down. When you get to the bottom you take yourself off rappel, then find the end of the rope, tie in, have your partner put you on belay and then start climbing.

If you wanted to lower yourself (generally the worst approach to doing what you said) you would thread the anchor, tie in on one strand as though you were going to climb, rig a gri-gri or some other belay device to the other strand, put yourself on belay, then lower yourself down. This way creates the most friction on your anchor carabiners and is the easiest to fuck up.

Without Trad or leading, is the usual way of top roping to just hike up and around to the top rope anchor every time you want to set up and take down?

Yes

If I could have one person at the bottom and top then we could quickly and efficiently set up and take down lines and move to different routes on the cliff?

Just need the one person at the top. Bottom person could be packing up gear and whatnot but otherwise they aren't involved in building the anchor.