Yes, I tried, and I switched back for the same reason as you. The amount of time I spent trying to work out whether I was on QWERTY or Dvorak, and in that case where was the full stop, far outweighed any possible benefit in typing speed.

When people tell me that QWERTY is uncomfortable, slow, etc, I honestly have no idea what they're talking about. For me, the problem is sitting in a chair staring at a screen all day.