AutoCAD does this with it's annotative styles (at least it's suppose to). I can't ever get it to work 100% right. Basically all annotative stuff - linetypes, text, leader arrows, dimension lines/spaces, etc., scale up/down in the paperspace viewport as you change the display scale of the VP. In fact, you can have multiple VP of different scales on the same layout showing the same exact annotations all re-scaled for each VP.
But again, I can never get it to work quite right (probably lack of experience).
Home-Dell T3400 Quad Core Q6600 OC'd 3 GHz., 8 GB RAM, Radeon HD 3870, Windows 7 x64
ACAD 2012, DoubleCAD XT Pro v3, Alibre 2012 Expert, 123D