Mostly I just fall off awkwardly. Especially if there's a cute girl nearby.

When I'm doing a standard stop, I like to swing/kick my left foot over the front handler, instead of swinging it back over the saddle. Feels less awkward to me.

I've ridden clipless fixed gear with no brakes, and let me tell ya, it's pretty damn scary at first

I unclip when my dominant foot is forward (either 3 or 9 o'clock depending on which way I'm facing). I lean my torso forward and unweight my dominant foot as I unclip. Then I placed my heel on the ground (dominate foot still) and come to a complete stop simultaneously. Unclip other foot and voila!

It's kind of a CX-style dismount, the FG variation being that you have to time it so you neatly disengage when your foot rotates to the 6.

I couldn't tell you how I dismount, never gave it any thought. I ride a fat bike off road. The only time this is a problem, is at a log over. You never know how the crank arms will line up. Murphy's law, they never do. I tried the jump off method, but found myself on the ground a lot. So now I act like I'm going to make it. If things go wrong, my feet go down on the log, and push off. Mostly works, but a little unnerving with the free wheelers behind me.

I usually slam my brake and do a front flip off the bike.

I really, honestly, never thought about this and it was never a problem.
Then again, I rode with platforms and ONE strap (just the leg that pulls up for counterforce).
So I was always able to move my feet around and maneuver around the bike if necessary.
I would also try to not dismount for as long as possible and that would require lots of hopping on the rear wheel to reposition for a trackstand so I never had that stoplight problem.
Idk man, sometimes I would stand on just one leg and wait until the crank arm lifted me high enough to effortlessly bring my leg to the other side.
You could also "dip" the bike down sideways while you kind of fall onto one foot if you needed to dismount.
Yeah idk, never thought about it.