There's a range of virtual tabletop software or SaaS out there. The two things that have kept my group from adopting any of them are: 1. Zoom is free and has been "good enough" for us so far, and 2. tech learning curve to create and load maps and encounter data into a virtual tt solution.
I'm the most tech-savvy of my group but I am not the gamemaster so I don't have leverage to push for adoption of a VTT. I agree about simplicity - we'd be fine with basically a video conference client (with screenshare whiteboard overlay ofc) and just a virtual dice-roller added.