Does anybody ever use the menu you get when you right click on a unit?

I never did, as I allways used keyboard short-cuts.
After playing the demo for a couple of days, I suddenly during a siege brought it up and studied it, and found 2 new commands:
1) follow projectiles - pretty cool (usefull??) to follow the boulders flying through the air, crashing down.
2) dismount / remount - now THAT's an interresting option. Do we get the option of mounting and dismounting horses during a battle, or is it mereky a leftover from something that didn't work out??????