Another Google Calendar user here. I use it mostly on my phone and syncs it with Taskito, which I placed as a widget on my wallpaper screen. I like having a glace of my weeks right on my wallpaper screen, which the widget lets me do. Other than that, I also use a refillable planner, which I'd fill in fortnightly-ish basis.
I have a wall calendar which is mainly a decoration and a showcase of the last year’s photos. I use MS Outlook to organize our life. It integrates between the various pc and apple devices we use and has become our diary ver the years!
I completely WANT to have a paper planner, but that's really only so I could have an excuse to make fun stickers to use in there. I even bought one a couple years ago and never did a thing with it. Whoops I guess I'll continue to be 100% a Google Calendar girl.