For me Bishop is the best bouldering location in the western hemisphere, maybe only topped in the extreme east by the Grampians in Australia and Fontainebleau near Paris. There are tons of other bouldering areas, but none that combine thousands of problems, amazing quality rock, perfect accessiblity, nearly always perfect weather and all that within a range of a few miles.
The clustering of the boulders makes Bishop so unique. As soon as you arrive in one spot, you do not need to move more than a hundred meters the whole day because there are so many problems. And the other upside is: there is something for the hard- and soft-mover. Well, not the real soft mover, but if you climb grade 6a you should get by most of the beginners problems.