What I don't understand was this quote:
"This is only the furthest edge of the Time War. But at its heart millions die every second. Lost in bloodlust and insanity. With Time itself resurrecting them to find new ways of dying. Over and over again."
From End of Time part 2. So, apparently, millions died every second, but were continually resurrected to keep fighting/dying? Anyone have any ideas on what this quote may mean?
IIRC, there are supposed to be two kinds of Time War. Type 1, we'll call it a Temporal Cold War because pissing on Enterprise never gets old, involves limited intervention: sending agents back in time to make changes favorable to you, while other agents protect your own timeline from enemy manipulation. In Type 2, you say "what the hell?" and throw open the floodgates of the Time Vortex, directly manipulating the elemental force of time as a weapon. Time freezes, reverses itself or is vastly accelerated as you see fit, you enemies die of old age in an eyeblink or stand perfectly still while the universe moves around them, whole star systems are erased from history and time is generally twisted into a pretzel or (dare I say it?) a "big ball of wibbly-wobbly, timey-wimey...stuff."
Though I can't remember my source which is... annoying.
However, type 2 and even type 1 should be fairly desperate measures on their part. The Time Lords are very committed to what they call "the Web of Time," the orderly flow of casuality where action A leads directly to consequence B. They invest much time and resources, and consider it their great cultural mission, to maintain the Web. They are highly committed to the idea that there is a single "correct" timeline which Must Be Preserved.
Maybe that's the only way a society of time-travelers could exist.
In any case, they've shown they can change over from carefully preserving the timeline to fucking with it, but it had better be damn important. Or part of the machinations of Gallifrey's ridiculously corrupt high political echelons, but those should obviously be an exception not reflecting the intentions of the Time Lords at large.