Really Responsive too and it all works in Opera or seemed to anyway, so many developers forget about Opera because it doesn't have the same amount of marketing as the others. But anyway Sweet Build!
Um, no. Many developers forget about Opera Mobile/Desktop because nobody uses it. Many developers forget about Opera Mini because it's worse to develop for than IE6.
Perhaps you should consider that even a few percentage point share of the browser market still translates to millions of users. About 50 million on Opera Desktop to be more precise.
If you don't care about them I guess you certainly don't care about the few people using screen readers; or how about Safari which has only roughly double Opera's measly market share?