My table has made great use of https://shmeppy.com for remote-play maps. The maps it makes are much less sophisticated (just painting color on the squares and lines of a grid). What it gives you instead are player/monster tokens that everyone can see, measuring tools, and "laser pointers" to allow participants to draw attention to a region of the map while speaking.

EDIT: also an awesome fog of war feature; how could I forget?

Actually having used these kinds of 2D maps, I find they're not fun enough for me. If you're really into old-school original D&D dungeoneering-with-a-ten-foot-pole stuff, it's nice.

But I want more for my players. The best maps have very nice multi-level dungeons, with strange stuff like underground rivers or a dangerous precipice connecting parts of the dungeon.