I make a better steak at home than most restaurants and I don't use a thermometer when I'm cooking on the grill, only if I'm roasting one.. I use the poke test just like the grill masters do! Once you have cooked a few thousand steaks you get a good feel for it. I also will not buy a steak (generally) that is less than one inch thick.
The last really good steak I had in a steak house was Morton House in Charlotte in '98. At about 50 bucks just for the cut of beef I ordered, I would have been rather upset if it wasn't very, very good!