All of the live games I play, and GM, use roll20 now. Being able to whip out a fairly detailed map with lighting and tokens on layers in an hour or so while the players trickle in, as well as let players who can't remote in has changed our playing dynamic immensely. Having a bunch of people share the "player" control to pan around the visible map, move tokens, and measure effects is marvelous; you've still got everyone sitting around a table, rolling physical dice and hanging out - but you've got extensive digital tools to augment what had for years (for me) been an arduous task of building boards, hand drawing maps - many of which never actually got used, making tokens, and getting up from my comfy GM chair to reach across the room to slide an orc 6 inches.