I don't use Atom but I would say, if I did, that my development environment includes hardware that has 800MB available. This isn't to suggest I'm ok with bloat, I absolutely am not. But if the most important thing on my computer is using up resources then I don't mind that.

I'm more concerned about how much work I'm able to get done, and with Vim frustration eats up more of my time than with a modern GUI.