I have a bullet journal. It doesn't just mean the specific brand but refers to to the style and method of journalling.
Yes, it helps me organise my life AND is a creative outlet. I don't just use it as a date timer or to keep track of things but I have also made it into an art journal. I have my standard pages of managing my calendar (dates, events, and diary items). I also have logs to track and record things - like mood, water I drink, and sleep.
It is really what you want to make of it.
You can spend as little or as a lot of money as you choose. Out there are available stickers, page inserts, printable organisers, and log sheets. Many people use their bullet journals as works of art. Scrap booking in them is very popular.
Basically, a bullet journal is a good reflection of the person to which it belongs.