Notational Velocity is mostly search based. I mean, it's a list of messages, a text editing field and a searchbar, nothing more. So system-wide shortcut to pop it up, Cmd-L to search and there you go. I'm mostly doing a bit of "SEO", so intentionally write content in the node that makes it easier to find. Tried tags, but that just added another layer and "Here's another good Bash Shell tip for Linux Servers:" makes it both more readable and provides hooks for searching.
Synchronisation has change a few times, it's just text files after all.
I'm trying to check whether the Zettelkasten method would help me, so I've currently switched to Obsidian and might try some others. They're still writing text files, so I can backport them easily when/if I'm done with it. Right now, I'm not sure whether just having a GUID/timestamp is enough even within NV. Sure, I can't just click on it, but that means that I just have to Cmd-C/Cmd-L/Cmd-V after it.
And being quite fond of Emacs, I try and fail with Org-Mode once a year.