I'm lucky, I live on the edge of the Peak District and rarely drive to ride - I have great trails on my doorstep and cracking road riding too and I tend to see time spent driving to ride as time that could be spent on the bike. I don't really do driving from here for, say, two hours to ride in the Lakes for a day then two hours back, though I'll do it for a weekend or longer or occasionally to hook up with friends. Four hours of driving is four hours mostly wasted that could be spent pedalling or doing something else.
That said, I can see why folk without obviously rewarding local riding would hop in a car to ride and I'm not about to throw virtual bricks at anyone. I don't really get the thing with people having a pop at others for driving or not, all the stuff about 'your local riding must be boring', 'you only need a rigid singlespeed fixie etc'.
I love the process of riding the same terrain in different seasons and watching it change and having to ride it differently as a result, and I love the thing of exploring the area you know and finding trails or route combinations you didn't know were there. Still finding new sequences of trails and new trails after living and riding here for almost 15 years.
I think it's a shame that we've somewhat equated exploration with travel. You can drive hundreds of miles and really discover nothing new while you're ignoring what's under your nose.
There was a brilliant bloke we encountered 'somewhere above Hayfield' a few month back who didn't like mountain bikers going past his house who somewhere in the middle of a very calm discussion came out with the line: 'I'm a real mountain biker, I'm going to Mont Blanc' as if somehow riding in the Alps was somehow better than riding on your own local patch because, well, presumably it was bigger and a long way away and the food's better...