Dealing's not the concern... it's collecting cards and chips. A 68" table is 34" from edge to center. Sit down and belly up to any table, and see how far your comfortable reach is.
I'm 6'5" tall, and more than 36" is no longer "comfortable," and probably wouldn't happen without knocking over 20-stacks of chips in front of me. This means I can pull about half the pot, but need to rely on people from the other side pushing stuff to me on a win, and vice-versa... and the other side will not always be my height.
I guess your friends are tall, on average, and they don't mind getting up to push and pull pots and cards? If they like it, that's cool, but I have a lot of players who would not be comfortable in that arrangement - especially some of the "bigger" ones, although they probably wouldn't say it out loud. (It would be embarrassing to keep saying, "help me, because I'm very fat...")