Mostly for labeling what goes where - i.e. which freezer drawers have what food, whose clothes (and what kind of clothes) go where, and so on.
It's probably not as useful if you live alone or with just a single other person and can agree about where to put stuff and remember these rules - but in a 4 person household things tend to get a bit unmanageable :-)
A good thing about the iron-on labels (besides marking childrens' clothes) is that they stick on the cheap-ass Ikea storage boxes (Dröna?) that are just fabric on top of cardboard.
I like MikroTik too. I kind of understand the dislike some people have for MT, but on the other hand a lot of it seems to be based on misunderstandings and outdated information.
Juniper isn't too bad either.
Not much experience with "corporate firewalls" (besides MT / Juniper SRX), but having seen Fortinet, it doesn't look too great.