Truly depends on who I am getting off of and where.
Standard - swing right leg over rump, touch ground, remove left foot
Young/training/tall horse - swing right leg over rump, lean towards offside, remove left foot and slip quietly to ground
At an event - depends on the crowding. I get off right or left side - mount right or left side. If I have been sitting for a long time, one leg is usually hooked on the horn and I might swing that so I am sitting sideways and just slide down.
I learned when I was about 10 (20 years ago) to remove both feet from stirrups, swing my right leg over and land on the ground, on my feet.. haha
So, skip ahead those 20 years, i'm riding again and my new coach teaches to dismount the way you said you would dismount a younger horse. She's never corrected me, just hasnt really said anything.