I use a Greenlee offset bender for 1/2" EMT offsets into 1900 boxes and such. Takes less than two seconds and they are all exactly alike. They used to have one for 3/4" but I haven't seen it lately.

For other depth offsets and saddles I use the Benfield method also, although I'll admit that if I'm in a hurry and only have one to do I'll eyeball it.

-Hal