Small bit of anecdotal evidence: I've started using it once I got to my latest work environment as soon as I noticed that the place is basically perpetually-contaminated and, well, plain dirty. Carrying a small bottle around to use whenever you're about to unexpectedly end up putting your hands on your face is also something I was taught to do.
Turns out that it's useful in both cases for me, since it's easy with a bit of experimentation and discipline to strongly correlate to a 90% prediction accuracy times when you don't disinfect your hands before putting them on your face and getting sick within a week with some germ/virus/bacteria-related illness.
For me, the "time gained" and general utility of avoiding minor illnesses like a cold or flu far surpasses the cost of the disinfectant, and I've seen no evidence that there are health-detrimental side effects if used "reasonably" (AKA only when strictly needed before eating or some similar criteria of less-than-X-times-a-day).
Mind, though, as stated above: It's only me, so YMMV. Anecdotal evidence and all that.
If it's worth saying, but not worth its own post, even in Discussion, it goes here.