Do "Natural" keyboards make it harder to use standard keyboards?

I use a normal keyboard at work, and have one of these fancy keyboards at home. I can touchtype with the same speed on both of them.

When you do switch between different keyboards after extended periods (laptop v/s regular, for example) it does take a little time to get used to they key placement, but within a few minutes of typing, you will get used to it - especially if you have used both the keyboards before.

Muscle memory is a great thing :)

No, if you're a touch-typist then going back to a normal keyboard is no problem.

I used my buddies keyboard while I visited him for about a week and I can say that I came back to a normal keyboard without any problems what-so-ever.

It's nothing like trying to move from a Dvorak back to a QWERTY keyboard, that's for sure.

I use that keyboard exclusively and I have for a couple of years. I have one at home, and had one at the office (before I started working from home). When I go to my in-laws it takes me a minute to switch back to a standard keyboard, but it isn't that bad.