Please add these features from the world portal plugin.
I hate making a huge structure just to make a portal. Why can't it just be a simple button?
Please please PLEASE add this feature!!!

"Teleport to other locations and world with signs, pressure plates, buttons and more
Easily create portals using a single command "

plugin: http://dev.bukkit.org/server-mods/world-portal/

Add this in the next update, i will to donate to you guys for all your help!

Command blocks can be used to perform commands via button presses and whatnot.

I think this issue is a duplicate of your other one, but again, please reopen with more information if you still think we don't meet the requirement.

Hi there. We're cleaning out the issue tracker since we (mostly me) have mistreated it.

This issue does not have enough information to warrant keeping it open, so I'm going to close it. If you're no longer interested in getting it solved or you already found a solution, great!

Currently MV provides Sign warps via the SignPortals extentio, Ref: https://github.com/Multiverse/Multiverse-SignPortals/wiki

Also note: You can make portals out of air (By making the portal and then deleting/breaking the frame) a common practice on some servers is to place a single glow stone on the floor that warp players when stepped on.

Note: I am NOT a MV dev but I do not see a use case for the alternative items such as buttons or pressure plates you have listed... as they would need to A: Have a sign to inform a player where they are going, B: teleport a player with out informing them where they are going and an air block portal is much more discrete than a pressure plate.

As always use what works for you no one plugin is going to provide a 1-stop shop :)