I have no idea how long floor generator has been a thing for, but it's definitely been a long time. Certainly the entire span of my time in arch viz.
Now after all these years the boffins have updated it, if standard floorboards simply weren't angled enough for you, you've now got some powerful options for rapid modelling of floorboards and tiles! Enjoy.
http://www.evermotion.org/articles/show/10077/floor-generator-v-2-0-is-here-