Tbh Mumble is just as simple as TS once you have it set up. It is just that initial setup wizard that is a bit of a fuss, but you can just click next through most of it. After that it's as simple as entering server details and clicking connect, just like TS, and not overly awkward like Vent which I hate.
The advantage of Mumble is not something you can see, it's the lower latency and better quality.