R/T load
No big secret here. Sectors are regularly subject to planned overload of 10%, and short-term superloading of 30-50%. If you are still alive [mentally speaking] after several months at the hands the promotion-hungry or the downright inept then you get a circular from the ATC OPS, which says that based on operational experience the basic sector flow-rare will be increased by 10%.........then the whole cycle starts again.
Couple this to all the verbal "mini-legal-contract" R/T crap that we are obliged to say and you get busy frequencies...e.g. Do you really need all those "expect levels" when they're written on the chart?
As for route information there is a lack of intelligent use of current facilities; use abbreviated routes in the same manner as those on STARS/SIDS, and use VOR broadcast if necessary.....it would be an "area" version of ATIS.