Yea, I've seen compilers use lea for some integer math in C/C++, because it is handled by a different part of the CPU and so can happen in parallel with other integer math ops.

People might say this, but it's not really true. All these instructions are decomposed into micro-ops, and then the micro-ops are run in parallel - if data dependencies allow that - on a common pool of integer ALUs. The reason to use lea is for code compression - it allows you to express two or three operations in a single instruction.

On some Intel CPUs there are separate address-computation execution units.