1) "Java" generics. That is, anything you could do with generics in Java. No one should have an issue using templates like this.

2) Non-recursive "typedef" programming. That is, uses like "::value_type" in the STL containers. These are incredibly useful to have around when writing generic algorithms, but their overuse leads to unparseable code to some set of C++ programmers. Use with caution, but still use.

3) Recursive templates and other subtle uses I haven't covered with the above two. Try very, very, very hard to avoid.

That makes the "will my coworkers understand this code?" question very easy to answer.