my 2p worth!
For travel i am more of a fan of small is all / light is right!
I cut down my kit to my 5D mk III and the 24-105! This is my general travel kit... covers most of what i would shoot on holiday/vacation. I will always add the 40mm STM, as well, it is so small, it is pointless not to!
If i think i need wider (city streets and landscapes), then i add the 17-40L too (small and light).
If the trip involves an event (wedding etc...), i would add the 24L and 70-200L, and take out the 24-105!
If i am going for wildlife, it is no longer a travel kit in my opinion!
Another consideration is how i am travelling. If i am going by car, then i am more inclined to add extra gear, but if it is flying, and lots of shifter around, then i go for smaller rather than larger!
In short, every trip requires different kit for me...
but if i want to go light, it is the 5D kit + 40mm.
All that being said, i often take things i don't use, and crave things i didn't bring! Sad truth!
Enjoy retirement, the re-introduction to the hobby and your travels!