The best part about Tiny Dungeons is that you get the taste for your Dungeon Delves and you can be in and out in one session often. I also loved the Dungeon Delve book and it sill sits in a spot on my shelf as a go too idea book. Along with the great first ed Encounter cards.
I had never liked with long Delves and that drew me as well to begin running Smaller Dungeons. The two biggest issues that I had with long delves feel to the time sink and the death of RP. Once a party dipped into the the first few rooms of a dungeon the games always would shift immediately from a free form fast paced game to a room by room slog. As well as because of this the first thing to fall by the wayside was inevitably the roleplay.
I highly recommend for all GM’s to give the Tiny Dungeon theory a try. It will fast become thing of second nature once you embrace it.
And you game the added bonus any Delve into a Large Dungeon becomes farm more epic in feel because your players are used to being in and out in a few hours of play.