It depends on a lot on how you do it. I've used the roll20 implimentation where players can quickly scrub their token around to see whatever they want in a way that results in jus being annoying to everyone while at other times I've used other FoW systems in other VTTs that required the players to say they want to move here & the gm to move their tokens making for a more interesting experience with mystery & the unknown. That second is helped a little by things like "you aren't sure, but with your perception are pretty sure the bad guy is somewhere around here" & so on.