Does it need a cliff that TS is effective?
You can use TS and instantly go LoS, which works great in Ruins of Lordaeron.
And if you get death gripped...run back to the position and there's only a single knockback immunity within the game which is exclusive to a single spec.
And a Rogue using CoS to avoid TS, really? I mean, maybe in 1v1 but in Arena you'd never use a cloak to avoid something like TS, spending such a crucial CD on TS would be a bit too much exaggerating it's importance.
Spell reflect doesn't work against TS since early Wotlk, it's a AoE spell and Spell reflect only reflects spells that directly target the warrior.