Nobody understands templates?

[FreeSlave]

Well, when you're starting to use many templates you may end up 
with separate library.

Templates provide compile-time correctness, concepts (in Boost 
sense), policy-base design (see "Modern C++ Design: Generic 
Programming and Design Patterns Applied" by Andrei Alexandrescu) 
and compile-time choice of the most optimized way to do things. 
Eventually templates are here just to ease programming of 
applications and reduce boilerplate. All these things that we 
expect from libraries and that library's author must take into 
account.

D is multiparadigm language so you should not worry if you don't 
use some of its features. You may ask same question about 
delegates, attributes or user defined exceptions. The answer is 
simple: it all depends on your style, preferences and needs, your 
vision how perfect code should look like.