We may have come from Africa, but it was during the ice age that we really got going as a species. Rapid climate change forced us to develop improved tools and technology to survive. This eventually led to farming, agriculture, cities and modern civilization.
Without the cold, we'd probably have been quite happy staying in the trees.
If you need the booze, you need the bees, if you need the bees, you need to stay for the summer. If you want a year round supply you need storage, if you have storage that is not transportable, you have settled.
If you cultivate plants, you can up the numbers and found city states- but for that you allready have to be half way settled. Else that nomadic sheep guy from across the fence will drive his cattle through your fields.
I enjoy running in the baking heat, soaking in the sun. My lungs don't get seared from the biting cold, and I can breathe. The feeling of evaporating sweat is glorious and invigorating; the shirt is optional.
I appreciate your personal opinion and experience, though. :)