I was really skeptical about a labeller too.
However, David points out that objects can have symbolic value as well as utility.
I believed that standard letter trays that opened to the front were fine, used them for years - no problem. Then when I moved my old ones were due a rfresh cos they were old and tired. I got side opening ones, that were deep and some risers, added a fourth tray - and has it been life changing - probably not. But is there a good difference from doing it - yes. Its a number of small almost intangibles that add up.
And it can be the same with a labeller, its not going to revolutionise your world, although being able to read labels can have that effect, its going to make things different in small ways that are just a little bit better.