Another huge thing I use the freezer for is frozen fruit.  I serve fruit over cottage cheese or fruit over yogurt at almost every meal. Not "dessert" exactly, but we all eat it at the end of the meal together vs. just during the meal.  It kind of finishes off the dinner table :)  I buy blueberries in-season in those plastic box-looking things and just pop the whole thing in the freezer.  I have stacks of them.  You can just reach in and get a handful anytime.  I buy peaches in-season, peel and slice them, and dust them with white sugar (!!!) and freeze them in 2 cup containers.  You can pry them out semi-individually with a butter knife when you want to use them.  A few fresh peach slices with two blueberries on a background of white yogurt or soft cheese is very refreshing.  Also rainier, van or bing cherries and then I pit them by hand and freeze them whole.  They are delicious served as their own kind of ice cream ... I mean I serve them frozen.  they are kind of like natural popscicles. 

Also seedless grapes.  their flavor intensifies in the freezer and as long as you eat them while they are still semi-frozen (i.e. don't take them out too early when you're making dinner) they can be frozen after their lifespan fresh is over.  I buy grapes, set them out on the table, everyone eats their fill in an afternoon, then I freeze the rest for later.  Just throw them in the freezer in a bag, on the stem even, they come off easily when they're frozen.  Bananas I keep fresh in the house, but at the just-past-fresh stage, they go in the freezer.  Banana bread and banana muffins are much better with the frozen variety.  just throw them in as-is loose.  when you're ready to use them, run them under lukewarm water and the skin just sloughs off.  then chop coarsely as you drop them into the mixer/cuisenart.  Also frozen bananas in a breakfast milkshake are awesome. 

Don't forget citrus.  I love ice water with a slice of lemon.  I buy big bags of lemons from Costco and then before they go bad I slice them in nice fat 1/4"slices and freeze flat on a cookie sheet.  Then they go into gallon freezer bags and I drop them into the ice water glass just below the last few ice cubes (i.e. I don't float them on top of the glass, they look better standing side-ways in the glass among the ice cubes). they retain their color very well.  Also I freeze oranges whole.  Then take them out and slice after giving them about 5 min on the counter at room temp.  They make beautiful garnish and the flavor intensifies when frozen.

Lots of people fill their freezers with 'pre-made, pre-cooked, microwave' stuff.  This is expensive and isn't really great food anyway.  If you hate cooking, truly, then I can understand this, but otherwise fresh-made meals are so much more appealing, even for one person by themselves.  Daily cooking is a way of offering thanks for being human, thanks for having food to cook, thanks for being able to cook.     not that you were asking for a philosophy comment ... ha ha ha

I'm looking forward to the other responses you get :)