Thomas,
Really? I mean you really believe it makes a difference? That's probably why you have so many uneducated players...they learned in a tavern or some other venue that has little control over the integrity of the game, or it's patrons.
In the first place, flopping all 5 cards simultaneously generates a board that is, well..."ass backwards!" Assuming the cards were taken off the deck one at a time, and the dealer spread them from left to right. The cards would read incorrectly. In other words, the first card off, would be the card on the far right.
Take a normal flop and arrange the cards so an ace is the first card, followed by a deuce and then a three...now pick the cards up and spread the flop in the normal procedure, (from left to right). Note that the cards will display 3, 2, Ace left to right. The point is; when I look at the 5 community cards, I'd like to know which cards were the flop, turn and river.
One note: If you happen to be left handed, and flop the cards from right to left, the board will be correctly displayed.