I'm another single person cooking for one. Sometimes I do refrigerate/freeze stuff, but for some reason I tend to not like frozen stuff reheated, I think it's psychological because I eat tons of prepackaged frozen foods. I also dislike eating something more than twice in a week, so not too many leftovers for me. Oh, an I don't really like cooking, but I like having cooked stuff to eat. I'm so picky!
For cooking, I do a lot of stir fries. I keep frozen bags of stir fry veggies in my freezer, and then by the precooked chicken (like Tyson's or whatever, forget the brand, there's a couple) to add to it. Or I'll buy some shrimp. Or, I keep frozen shrimp and Qorn (I think that's the spelling, 'fake' chicken) in the freezer too.
I also do fajitas. Sometimes I'll get fresh veggies. Sometimes I'll use frozen fajita veggies.
Fish is another 'one serving' meal for me. I'll either buy a fillet of tilapia and marinade, or I'll buy something from Whole Foods that's premarinaded or otherwise prepared.
I do a lot of frozen veggies that I steam. Or fresh salad-in-a-bag, get a spring mix and some tomatoes and I'm good to go. Or even those Green Giant veggies for ones. Sometimes I'll cook or steam up some fresh asparagus, broccoli, etc.
I also eat things like sandwiches for dinner. The deli near me is accustomed to me buying 3 ounces of turkey meat and a slice of deli cheese at a time.

Or I'll get one of the 'premade' entrees they have, like a stuffed chicken breast or kebabs to cook, now and then.
Occasionally I'll make something more ambitious, that serves 4-6 people, and freeze. Like shrimp creole, I do that sometimes. Or something chicken-ish, since I buy like a pound of breasts at a time. But usually it's one skillet wonders.
Frozen foods, I do eat a lot of. I'll on rare occasion eat Healthy Choice, or sometimes a Lean Cuisine. Lately I've turned into something of a frozen food snob, as it drives me nuts when I can't read the label and understand what's in the food. I've been getting a lot of frozen meals at Whole Foods lately, and I especially love the Amy's vegetarian line. Kashi has some good stuff too. Unfortunately, these meals tend to be about twice as much as regular frozen food (close to five bucks), but I reason that even if I add a salad and some fruit to round it out, it's still cheaper than going out. Oh, and I'm working my way through the frozen pizzas available at Whole Foods as well.
Then I eat out some, usually fast food or chain restaurant takeout. I'll eat Applebee's (WW menu) or Chili's (Guiltless Grill) to go. Or I'll pick up a salad at one of the fast food places. Wendy's chili is something I crave in the winter. Or I'll get a grilled chicken sandwich. I love McD's french fries, too, but I've been craving them less lately so I don't get them much. Oh, and the soup-and-salad place near me sees me about once a month, it's about 8 or 9 bucks to do takeout, but I can make two meals out of it. Usually I add some shrimp or chicken from home to the salad.