I still second the click > box select. – But I believe that´s mainly a matter of taste and the 3d software you are coming from. Since I used 3dsmax for 20 years already, I don´t miss the click drag at all. – You can simply change that shortcut yourself, if you look at the link Reiner posted above. In the modeling environment I also see no conflict with other shortcuts, but in UV editing it gets a bit annoying, because the only way to move things around there is the left click drag or the didicated move shortcut. Still it speeds up things enormously fo me.
