Goal-line technology itself makes sense - although I'm not even convinced that has to be as "technical" as people make out. Appropriately stationed TV cameras & the general rule that - "if studying the replay for a limited amount of time doesn't clearly show the ball is over the line, then it isn't a goal" makes sense.
Indeed - instead of introducing extra officials - why not just give more power to the fourth official. Allow him (rather than forbid him) to use TV monitors to review close decisions & ensure he is in constant communication with the actual referee.
I also don't hold with the argument that: "it's wrong to introduce technology into top level football because it should be the same as park football". Why?
Just because they have hawkeye at Wimbledon doesn't mean they have access to it at all tennis clubs around the country. Even at Wimbledon the technology is only available on the show courts (I think!) and I'm 100% sure nothing of the sort is available in the qualifiers. That doesn't make it a "different game" it just gives the top games the opportunity to be fairer.