Are you seriously grieving for monarch? A company that nearly went bust several times? And whilst I agree the work there may have been a lot less and "suited" your lifestyle; maybe, just maybe, the inability, or slow pace of change there has something to do with it's likely demise.
I've been in BA 17 years and I too wish I could go back to the workload on the 757 in 2000. 500 hours per year and a nice mix on LH&SH. Times change and companies adapt or die; I don't particularly like it either, but maybe in your case nostalgia is rose tinted?.
The trick in BA is to peddle on that hamster wheel for 20 odd years and not stress the crap you can't change, then hop off and enjoy your pension.(what's left of it).