Yeah, counting is a beeatch. I sometimes do that myself on the 07. Riding along in 6th and I'm looking or 7th, thinking I'm in 5th. It happens..
It will also become second nature to you after a while, so no counting required..
Yes have done this probably with every bike I have had. Its a cool feature on my 15 that has the little 6 that lights up on the speedo when in 6th, I think I still did it once though LOL.