I find since I moved from Tomboy to OneNote that my memory is significantly worse.

Tomboy didn't support pics so I was more tuned in to meetings as I was actively processing info in order to note it down in my own words.

Now in Outlook I often tune out when I feel something is less relevant, and I lazily take screenshots "in case I need to look at it later". Then, when something comes up that is more relevant to me I'm tuned out and need to catch up. I also remember information much less long because it never really entered my brain at all.

So yeah it definitely helps for that purpose, at least for me.