It's a common knowledge that you can stand up from prone by switching the direction you're facing, and I think this is good and nothing is wrong with it.
This might be just me, but it's annoyed me to no end when you try to prone in the direction opposite of what you're facing, you press prone once to executed the manuever and you see your soldier do the prone animation in the expected direction, and ended up still standing because you press prone 1 or 2
frames before your cursor switch side...
It would be nice if the game would add a tiny amount of time-delay (say, 5 frames) at the start of the animations, or wait until prone animation finished, before you can switch side to stand up.
I doubt any one cares or shares my frustrations though... So meh.