Backlit keyboards are handy when working with DJing gear in low-light conditions. The same can also be said when working as a lighting designer for a stage, in which your surrounding settings will tend to be pretty dark (because you don’t want to draw attention to yourself). And although I’m not a gamer, I completely understand why gamers prefer backlit keyboards — especially higher-end ones on which individual keys can be programmed to render as a specific colour. It’s not my jam, but it makes plenty of sense.
More casually, I also prefer backlit keyboards when first getting my fingers onto the keyboard when I’m about to type — especially when I’ve been doing other tasks not involving typing.
Although I don’t generally look at the keyboard whilst typing, I also crumpled and binned my entire middle-school term of having to learn to old-skool ASDF-JKL; on school electric typewriters around the time I used a Macintosh Plus for the first time (to write a paper a few years later in grade 12), because I found ASDF-JKL; to be inorganic af to do so on a Selectric, much less anything else. And… and… had I not discovered my eventual pecking method of relying on my first two fingers and thumbs, I’d likely be dealing with some variety of carpal-tunnel syndrome now.