With regards to the famous English water, essentially the water at Burton on Trent is legendary for the harshness of the make up. Brewers around the world when making English ales, and even other ales, will 'Burtonise' their water, which is adding harsher compounds, calcium and magnesium bicarbonates.
A lot of craft breweries appear to be in slightly rural areas where they are more than likely using rain water, quite soft. If the brewer doesn't want to/feel the need/has a different plan to adding hardening, then you won't get those true English bitter ales. There's a great argument for doing it, there's also a great argument for not doing it.
Also, some places might be really pushing a line of all local/natural - and you could probably say buying in Magnesium Bicarbonate from somewhere and chucking it in... isn't really local.
I could bang on for ages; if you want some heavy material;
http://www.antiochsudsuckers.com/tom/brewingwater.htm
As for the overly hoppy beers... I'm pretty much over them. Have been for a while. Low alcohol beers (-3.5%) are really where I'm focussing.