I would die if all I "ate" was a shake. I have to eat real food or I'm no fun at all to be around.
I usually have some cooked meat like ground beef (seasoned with salt, pepper, garlic powder, chili powder, and cinnamon.... may sound weird, but its magical i promise) or I make something like this:
http://www.theclothesmakethegirl.com/2011/04/29/stovetop-pork-carnitas/
Except I made mine in the crock pot and it worked just fine. They even got nice and carmalized. I used beef brisket to make this once in the crock pot also:
http://www.theclothesmakethegirl.com/2012/01/13/deconstructed-gyro-salad/
It was so good there are just no words. And I had leftover meat for the whole week. I made tacos and all kinds of things with it besides the gyro salad thing.
In winter I made this thing a few times with lamb stew meat, hot yellow curry powder, and I threw in chunked up acorn squash, swiss chard, carrots, tomatoes, onion, and whatever other tasty stuff I had lurking that needed eaten up. It was pretty tasty.
Its pretty much unlimited how creative you can get if you have a crock pot. Its so easy to just throw a bunch of stuff in there and get deliciousness.
Same if you've got some already cooked meat and a variety of fresh veggies with which to make a hearty salad or some other sort of combo. Doesn't take much time either. I usually make myself a big bowl of Pico every week and I put it on like everything. If I'm super lazy and just make an omlet or scrambled eggs I'll pile a bunch of pico on there. Really fast, tasty, and filling.