Yes Liz, no problem freezing portions of lasagna or mac & cheese, except that in both cases the thawed & reheated portions will of course likely be a bit dryer than the original version right out of the oven. Certainly doesn't affect the taste though, which may be even better in the case of lasagna. For the Mac & Cheese, sometimes I add a bit of milk or cream when re-heating which kind of returns it to fresh baked consistency.
As for the Velveeta, I figured someone would comment like you did. That's the way I used to feel too - however I found that it adds a nice different cheese flavor to the dish, and it melts easy & well, adding to the creaminess/smoothness of the sauce.
I haven't frozen S. & S. pork, but I don't see why not, except that the pork pieces would likely have softened up & lost their nice crispiness - but flavor should be just fine.
I have no problem posting recipes - in fact I rather enjoy it - keeps me busy when I have nothing else to do - which is fairly often in retirement - LOL
P.S. I'm having my mac & cheese for lunch today - should be ready in about 15 minutes - 2 serving portion, so 1 portion will be a leftover for sometime this week.