As I get older, I start to see the wisdom in not wanting to have to look up a table. So I've got my own simplified point buy. The characters buy their stats not by the score, but by the modifier. For my standard games, which features powerful but not superheroic characters, I give them a +8 modifier. Pick any scores you like, just so long as the modifiers add up to 8. Three even and three odd.
This has some upsides and downsides. ON the upside it quick and simple, no chart to look up or math to figure out. It also makes it easy on the DM in judging ability scores of NPCs. On the downside it basically eliminates ability modifiers for race - and if you don't want to make half-orcs unplayable you might want to forget about one of the -2s, otherwise the halforc essentially starts at +7 rather than +8. And higher ability scores aren't weighted, if that bothers you. It hasn't been a problem for me.