The thing is, it only does for a few days. At least for me. Then the coffee isn't helping at all -- it's just keeping you at the same baseline you previously were at with coffee.
I used to drink coffee all the time at just a constant level. Then I just got tired of feeling "dependent" on something and weaned off over a couple of weeks. Which was fine when you don't do it cold turkey -- just a little less energy each day but easily manageable.
Now I still drink coffee sometimes but I use it as a temporary performance tool. I'll "start up again" on any particular day where I have a ton of meetings, where I didn't get enough sleep, where I have to do a lot of physical stuff, etc. Often this might be several days in a row, where I increase my coffee each day a little more relative to the previous day for the same effect.
But then as soon as the demands stop, I immediately taper off to zero again, usually taking 2-5 days to do so. Not really because I "don't want to be dependent", but because I want to make sure I can get the full effect of coffee again the next time I need it, whether that's in a week or a month or three months.
It's kind of weird that I'm always fully aware of exactly how much I'm "dosing" myself with coffee. I'm almost always either "tapering up", "tapering down", or just off of it completely.
But it's very effective as a tool that way. Way more effective than when I just drank the same amount every day, which I discovered was no different from not drinking any at all (after tapering off).