Sorted tree view in htop or alternative?

Looks like Glances should have what you need:

glances --tree

And then sort using commands m,t, i etc. Full command reference

A 2019 update on this 2014 question that ranked highly when searching for this topic is that htop has this built in now, and in the current version 2.2.0, simply pressing t in the default view generates a process hierarchy.