Man, what a fun ability that was to me.
When I play a spec, something that always makes it more enjoyable to me is when I can make a choice depending on the situation.
Enhance has that right now with maelstrom. Do I spend it on a heal? Damage? Wait for 10 stacks? Single target spender? AoE spender? Heal an ally? Save it for a good opener in the next fight? Etc.
I feel like Echoing Shock gave me some of that when I was Ele. And now with the new talent trees, I keep seeing places where it would be so fun. You could use it with electrified shocks for cool AoE. If you had Windspeaker’s you could use it with earth shock, and weave instant lava bursts in between. If you had Further Beyond you could use it to extend ascendance more. If you had a Power of the Maelstrom proc you could do Stormkeeper and then Echoing Shock to get double instant super chain lightnings 
Yeah this is probably all OP. I get it. It’s just sad seeing something that opened up all these fun possibilities get removed. Right now Enh is just way more fun to me because of the choices.