Nor me.
Trouble with the touch screen is that you have to look at the screen (and therefore not at the road) - a) to make sure you're prodding your podgy finger at the right thing, and then b) to make sure you activated it. I was slightly uneasy with this, on busy roads. With a button-led system you only have to give it quick glances when you can.
Putting 2 screens on the Back button really is a win-win, you don't lose any functionality at all and you gain this handy 'toggle mode' button.