I've never been to the Original Pancake House when it wasn't jam-packed. There's always been a wait (although the bunker of seating near the entrance is comfortable enough)--and for good reason. The food there rocks.
The coffee may just be decent, but the mainline buttermilk pancakes are amazing. The link sausage is delicious. The loaded American fried potatoes (cheddar cheese, bits of crisped slab bacon) have brought me back after years spent going elsewhere. No matter when I hit the Original House, as our family calls it, I'm sure I'll get consistently good breakfast food -- good ingredients, well prepared. Consistency and quality. The service is also always hopping and professional, too.
The only real downside to visiting the Original House is the hustle and bustle all around you while you wait. The tables (there are a lot of them) are fairly close together and with every one of them full and the waitstaff circulating in between, the activity and noise can get to be a bit much. That is, until your pancakes arrive, and then who really cares because pancakes. There are no bad pancake choices and so many choices to make.