UPDATE #1 (ammended to the original post above)
Someone, correct me if I'm wrong, but the new patch allows the togglebehindview trick to still work in some cases. There have definitely been some servers that have updated to the latest patch that still allowed my togglebehindview bind to work and some, it didn't seem to. I'm guessing they fixed it so via that server-side setting that Ðork mentioned, the server admin will be able to decided whether to allow behindview. In my opinion, this is the perfect solution. They also fixed the 'toggleUI' bind that would get rid of the HUD and allow you to bypass the effects of some of the weapons.
So basically what this means, is you can still CJ by the above mentioned method on some servers. Even if a specific server does not allow behind view, it is still possible to CJ using another, more difficult method that I will describe below:
Basically, you will have to shoot a timed concusion grenade (which requires you holding down the alt fire button for an extended time) and shooting it at the ground while standing still. It will not explode instantly like an untimed grenade, rather, it will bounce up and come back down, hopefully with enough time on its fuse to allow you to stand over it. You will want to have your back to the grenade so when it explodes you wont be blinded. It will take a lot of practice to get the timing right, but what you will have to do, is jump right before it explodes. Then, like before, simply enjoy the ride, using your jumpjets as needed.
Be warned, this method is a lot harder and requires even more practice but if done right, can get both amazing distance and height as before. For best results, you will want to do these jumps from a flat surface otherwise, when the grenade bounces, it will not come straight back down and you'll have to chase it down before turning your back on it and jumping-- making it much more dificult. With this method, it is a lot harder to get consistant jumps without practice. Have fun