A huge renaissance in desk toys, at the very least!

You're joking but to be honest the reason I'm most excited at the moment about this discovery is because of desk toys. The way I would calculate excitement is usefulness / time to market and the respective graph of a superconductor application (at least in my monkey brain) peaks at desk toys since they would come first.

The Meissner effect has a lot of potential even outside of the energy efficiency changes (which is by far the most important).

It will be fun to see trains levitating over the ground without any friction loss from the wheels at high speed.

Isn't majority of energy lost spent on pushing air away when we talk about high speed trains

yes, but friction of the track is also a big factor.