Before I answer your questions, I have to throw this in. BT are NOT featured on the new rulebook. That is Dark Angels. Secondly, BT were pretty competitive in the last edition, especially with the FAQ updates. True, you couldn't play their codex like black armored space marines, but they had things that other codices did not, like Veteran Skills, dual cyclones, and of course 20-man squads.
Templars do make use of psykers, but not in a battlefield sense. They use them for navigation through the warp, communication, etc. They just don't trust them in a battle situation.
They don't do a lot of sneaking around, either. From my understanding, the Neophytes can still do some recon work if necessary, but its doubtful that this would be that useful. There is quite a bit of recon that can be done with sensors, land speeders, and orbital scans. They can also rely on recon provided from other chapters, IG regiments, etc.
As you said, Templars aren't much to plan an attack in the sense of sneaking in and causing a disruption. Instead (like most chapters, actually), they face the enemy directly on the battlefield with a final objective in mind.