Visual Studio has had Intellisense since forever, clang-format can enforce style standards, static analyzers these days are amazing, the address sanitizer and valgrind find memory problems easily, etc.
The most obvious example to me is in Eclipse, you can right-click on a field in a Java class and choose to Rename it. It will then correctly update that field's name across the entire codebase. AFAIK this is impossible in C & C++ because they are such complicated languages to parse. Macros alone make this feature effectively impossible.
As a daily user of Resharper in both C# and C++, I really notice how much poorer they work in C++. Renaming operations, as you mentioned, do work in C++ sometimes, but not others. Generally if it is a variable or parameter that's used locally I can rename it instantly with no problem. If it's a variable exposed in the class header, then it will tend to sit there churning for enough time before I decide that I should probably cancel the operation.
Likewise, simply using a "Find References" or "Find Usages" in C++ usually works, but at times it gives odd suggestions of things that are clearly not usages of the thing I'm searching, but something else with the same name that it just is not smart enough to understand is not a real usage. (possibly due to the difficulty of parsing templates or macros)
"Extract Method" is one of my favorite C# refactorings. Resharper C++ also has this operation but it is a bit of a gong show, and generates results that usually have to be tidied up considerably afterwards.
Try renaming buzz in this context, you really don't know how many other classes that need the same rename. In Java and C# you know because of generic constraints and IDEs can leverage this information. Concepts in c++20 should hopefully solve this.