Not so much the pressure itself... I agree that can't be simulated. I was thinking the mindset. What you value and how you look for it. With a big enough increment though, it doesn't really matter, and the goal should be to avoid those situations in the first place.
In my opinion the best practice for tournament play is to play in tournaments.
We shouldnt forget that blitz can also be very good as a tournament preparation, guys. What I mean is that you can try out all your prepared opening lines in so many different games and against so many different types of opponents that you might really find the weak points in your preparation. It might help you to build up a more solid and complete opening repertoire.