I haven't read the whole thread, just your posts OP. I use my slow cooker all the time, in fact I have 2. I put everything in, mainly frozen and cook high for 4 hours or low for 6+ hours. An easy chicken casserole recipe is "cook from frozen" chicken breasts; frozen casserole vegetables; lump of frozen garlic: stock pot; stock cube; rosemary; thyme and sage. Add bacon lardons for added flavour (I usually use smoked).
I make curries, chilli. stroganoff, bourguignon, roast joints, whole chicken.....I use frozen veggies a lot. (Frozen onions, garlic; basil and ginger are superb). Keeps costs low and really eeks out meats, etc. It saves loads of time and means you can have a meal good to go when you get in from work. I often stir in frozen or fresh spinach, green beans, mushrooms or cauliflower rice an hour before it finishes (if I am at home).
Keeps warm for a while (one of my slow cookers automatically goes to "warm" function, when it is cooked).
My daughter has a triple one from Lakeland and my son's one can be popped on the hob to brown, re-heat, etc, but seriously, there is no need at all to pre-prepare, just bung it all in and it's good to go.
I couldn't be without my slow cooker and use it most days.