I've had a couple of instances recently where goal-line technology would have been useful, but you'd never see it in non-league football.
03/04/13 - Polesworth v Rugeley Rangers (Midland Combination 2) was nicely poised at 1-1 on 72m when a long-range blockbuster from Polesworth's Fallon beat the keeper, cannoned off the underside of the bar, and came down and out. The linesman flagged the goal. I wouldn't have liked to call it one way or the other from where I was standing. It wasn't disputed by the players other than half-heartedly, and it rather turned the game, Polesworth eventually winning 4-1.
16/04/13 - The second instance was at Solihull Moors v Harrogate Town (BSB Conference North), the game goalless on 58m, when a Solihull attempt - from where I was sitting in the stand - appeared to hit the back of the net and come back out. And most folk around me thought the same - we were all saying "Wasn't that in??" None of the officials reacted, however, and the players didn't protest. The Moors website match report gives it as "miraculously cleared off the line".
I'm pretty sure the officials get it right the vast majority of times, y'know .....