Can we turn off the new jump animation?

There is no way to turn off the jump animation, the old jump system is just not there anymore. From a CCP BunnyVirus on the official forums:

Giovannui wrote:

The new jump animation introduces too much lag when multi-boxing. is there a way to turn it off? If not, please give us the ability to use the old system again.

there is no old system anymore

I'm not sure how the new jump system interacts with traffic control or any of the other reasons preventing a jump. But I would assume that any significant difference to the old behaviour would be a bug and you should just report it to CCP.

If the gate can't be activated for any reason, you used to be an easy target on the gate while unable to jump. I would assume that this behaviour is still the same.