Most of you may know this already, but in case you don't, something I found really useful for saving me a lot of time in LaTeX is to use
for putting maths on a line, without a number. It basically acts like
but is much quicker to type. Note ;I don't think you can assign a label to \ [ \ ], so it's less useful if you actually do want a number.
Also, depending on the editor you use, you should be able to set up command completion (or snippets) for common commands. For example in
TeXnicCenter, typing "equ <Ctrl + space>" produces