I often see people complain about how async is implemented in certain languages or frameworks - are there any examples where people actually like how async was designed or handled?

I can vouch for Go.

Took me a weekend to create a basic trading algo tester in Go that leveraged all computer cores.

And I was new to Go and Llama didn't exist back then.

These days it would have probably taken me a Sunday morning to do the same

Go

Old school solution effective, Python3 cgi, jquery, solid. Agree Python async sucks.

It's about getting it done.