People seem to ridiculously inflate this cost. If you are going to be using a tool for 40 hours a week 50 weeks a year for the next decade then you will be using it for 20,000 hours over the next decade.
Spending a few hours to configure it to your liking. In fact if you start atom and wait 6 seconds for it to start just once a day then twice wait 3 seconds for a new window you will in the same time frame have waited 8 hours for atom to start.
Heres the thing, its a cost you pay for every single project you start and every change you make to your build system. Emacs makes it possible but hard to maneuver, by my reckoning.
There are some really giant projects where that becomes reasonable, but for me thats just not the case. And if I were going to invest time like that, I'd rather invest it into an environment which has a higher ceiling for what it can do (emacs doesnt provide fast/rich/easy autocomplete, for example)