Most C++ IDEs have problems, probably because C++ is a difficult language to fully parse. I’ve only ever used Visual Studio and KDevelop.
That's me, about seven years ago. Then I tried Qt Creator. Now I'm an evangelist. It just works. It parses all your code in seconds and you get autocomplete and syntax coloring that's very close to perfect. The interface is as clean as it gets. And yes, you can use it without ever touching Qt (the framework) at all.
The only thing is, try to avoid versions > 3.2.2 since they are a bit buggy.
Edit: fixed typo.