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You can "pop" as you navigate around.

Also, I've had a lot of luck with pycscope.py for python code + cscope tools.

GNU Global needs some love though. It'd be awesome to see it handle more stuff.

I wrote this some time ago for navigating with (g|e)tags, allowing you to view the current stack as you drill down: https://github.com/markhepburn/tags-view (you can prune the stack too, so you only see the important bits of context)

It worked well for my own usage, but it probably needs some love. I'm not sure how *cscope works though, and if it would be possible to add it as another backend.

I agree. For static callgraphs I use doxygen, for dynamic I use "m-x gdb" :-)