I've found it to be a slightly more structured & useful way to essentially interact with my own brain -- it's a place for me to vent, a place to record not-so-important but still fun-to-have memories, to keep notes & sort out plans for the future.
It's a lot of fun to be able to scroll back and say "hey, what did we do for my birthday three years ago?" :) It's also fun at times like new year's to flip back through my journal and remind everyone what they listed for a resolution last year.
The reason I had to order a physical notebook online is because I wanted a pocket notebook with no lines, dots, or grids on the pages, which is surprisingly hard to find. I'm attracted to the non-linear approach to notebooking, and plan to fill this one with content in a random page-order as things strike me. Sometimes I just have a cool thought or sentence, or just want to slowly fill a page with something, and it can really help your creativity solidify to have a trailing log of your weird random inspirations. Sometimes I just transcribe lines from a song or book I like, or write down something someone said. Some pages are just geometric shapes. Rarely, I'll make a simple "today this happened and this is how I felt about it" page. By the time you fill it up you have a really organic document that can help you understand what makes you unique and what you like / care about in your daily life, without the stress of writing a cohesive or linear work.
Journaling is an efficient way to elucidate your stray thoughts and feelings. Writing forces you to distill everything into cohesive paragraphs, which in turn forces you to put some structured thought around otherwise nebulous mental energy.
However, journaling is only helpful so long as it's supportive. If you get stuck in reinforcing thought loops or you find it just amplifies your frustrations, it's time to change your approach to journaling or find another outlet for your thoughts.