TeleportEffects latest release introduces a whole new messaging system in the plugin. Now, during a teleport, you can send messages to the players in form of ActionBars, BossBars, Chat messages and even Titles, as well as in-game sounds! To find out more, check out the updated Configuration page in the Wiki.
Thanks to p0ns's issue report, the /toggleteleporteffects command is now been fixed. Also, it has been removed a bug occurring when the DURATION in config.yml was lower than 1.