I know it's not "canon" and all, but I prefer the explanation in the novel "Federation" that what really makes for a huge improvement in warp travel times is the introduction of inertial dampeners. Prior to that ships had to accelerate and decelerate at very slow rates so as to avoid splattering passengers all over the bulkheads like a new coat of paint. Inertial dampeners made it possible to accelerate/decelerate far more rapidly, and thus made warp travel far more practical. Dilithium in turn allowed for the attainment of higher warp speeds. (I forget where that came from, yet another book I'm sure.)
There are a few nice ideas in that synopsis, but overall it just seems too "StarWarsy" to me.
There are a few nice ideas in that synopsis, but overall it just seems too "StarWarsy" to me.