Most of the attacks that I just mentioned weren't required in the time setting that the movies take place in. The Prequel Trilogies time line the Republic was pretty much completely peaceful, full scale wars hadn't been fought for thousands of years. As such the Jedi didn't feel the need to teach there students such destructive abilities. (I'm referring to techniques like Battle Meditation, which would be useless in an age that didn't have any full scale "battles". Darth Sideous didn't learn the Force Storm ability until after he had been resurrected as a clone in the Dark Empire series, which happens after the movies.
The force drain was a purely destructive attack, literally eating the life essence of people, as such Jedi wouldn't be taught such a move, and Nihlus was a wound in the force. only certain, very powerful ancient Sith could use that attack in the first place. Naga Sadow's ship was infused with Sith magic and both he and his ship were destroyed thousands of years before the movies, and the secrets to the
Luke is pretty much the strongest character in Star Wars history, but he didn't become that powerful until 20+ years after Return of the Jedi.
So basically, to answer your question, the Jedi had no need to learn such abilities because the age that they lived in was completely peaceful, and by the time the Clone Wars occurred it was pretty much too late. However, many powerful "destroy in mass" techniques were used in the Clone Wars, and we don't see them because the movies only cover a small fraction of the Clone Wars. For example, mace Windu has an ability called "Shatterpoint" that allows him to see the weakness in anything. he can literally shatter a diamond by tapping it in the right place. he used this ability to defeat Darth Sideous in Return of the Sith.
http://youtube.com/watch?v=yJgEiXarCow
(Excuse the crappy music, was one of the best videos I could fine.)
Note some of the attacks. Yoda levitating hundreds of Battle droids in time for nearly hundreds of enemy ships to fly into them and explode. Yoda using the force to make two massive troop transports collide with each other. Mace and Yoda together using the force to force push what looks like an entire army of droids back, to the point were they look like a giant wave.
http://youtube.com/watch?v=s_hN5zplt5s&mode=related&search=
Mace fighting an entire army droids by himself and without a Lightsaber. And before you say it, yes, Lucas did indeed confirm that these powers are not uncommon for powerful Jedi. Why Mace didn't simply use these powers on Geonosis.. I'm too tired to explain. However just for food for thought Lucas said that the army on Geonosis was absolutly massive, it was a factory planet, after all. Not too mention that the army on Geonosis had a lot more tanks and walkers, and had much more air support.