T.F.
I am not a slow cooker person unless it is pulled pork or something like that.
I love to be in the kitchen prepping meals but not spend ALL my time there. Allrecipes.com has a lot of good things on it which vary from basics and simple to very elegant and difficult.
For the record, I make a homemade marinara from scratch and I keep at least of quart of it in my fridge ready to go because we eat a lot of pasta,e tc. I also make the stuffed shells or manacotti and keep some in the freezer so all I have to do is heat it up. While it heats, toss a quick salad and heat bread and you're done!
If possible, since you have a tough schedule, use a weekend day or night to prepare some foods for the week.. meatloaf, lasagna, pasta, casseroles, etc.
Good luck.