I've kinda seen this trend lately too. Not so much with the echoing, but with playing music. A lot of newer places have a pretty prominent bar up front and try to be a combination "club" and restaurant.
There's a local sushi place I go to for example that's like this. The decor is amazing (a bit trendy, but still nice)- nice place with AMAZING food. The only problem is the techno music playing in the place is loud enough to make it difficult to talk at your own table. I still go because the food is admittedly very good, but it can be frustrating.
You mention McDonalds and wanting to shuffle people out though - I actually read that they (and some other places) are trying to get more aggressive on that now. Main reason is that a lot of places (incluidng McD's) is now offering wifi computer access - customers using that are spending upwards of 30-45 minutes at a time there when they previously averaged between 5 and 15 minutes in the dining area. It's causing somewhat of an issue
. Heck the other day I was in a Panera Bread (also with wifi - which was actually the reason I went on this trip
) and noticed a sign on the wall stating something close to:
"Wifi access is provided free to all customers, but please be respectful and limit your time to 30 minutes during peak times.".