It doesn't hurt to be efficient, but at the same time, your own time is probably more important than efficiency in some situations. C2 tests show that you can have 100,000 sprites whizzing around on your screen, so spending hours trying to shave off an object here and there probably isn't worth it.
Although I think if you're targeting Android etc you do need to be more efficient, especially with memory. But if we're talking about 10 text objects or something, I wouldn't worry about it at all.