Ahnehnois
First Post
Well, I did (spoiler alert) make that number up. But I'm very precise about ranges and speeds, and I almost never spend any real time resolving issues related to those.95% with D&D really sounds like an exaggeration to me, especially if you follow the rules closely, which is an assumption I made when I made my post. If hte rules are followed loosely, then it is easier, of course.
If, for example, a spell is medium range and at 5th level is 150 ft., it is quite rare that a character will ever be exactly 150 ft or 155 ft away from the target. Most of the time, they'll either be closer or much farther, and the usability of said spell will be clear. Same thing for movement. You're in melee, you're in move range, in charge range, or you're X number of rounds running away. Rarely do the exact speed numbers come in to play.
Attacks of opportunity are easily adjudicated; it simply matters who's threatening who, and modeling one 9-square area in one's head is not a big challenge.
Where grids come in handy is when someone is trying to snipe an enemy from a particular range and both of them are moving (unusual and borderline metagame-y) or when there are more combatants than people can remember, which based on how human short-term memory works I generally assume to be around ten. Again, rare.