I myself has been a Electrum user, and I thought that it's really secure but this kind of exploit is really a wake up call for everyone not everyone is vulnerable and those hackers will attack when you least expect it. So far I haven't lost anything though, but nevertheless, I'm sorry for those who have lost their precious Bitcoin and in any case I won't upgrade unless I see some official news from the dev.
I was seriously considering to ditch Electrum and stick to Core, but the thing is that I use ChipMixer regularly and I need a light weight client to near instantly import any private key, which is what Electrum does.
If you do that with Core, it will take hours and hours to get the job done. Yes, I could use something else, but there isn't much that I trust enough to expose my private keys to it.
It's not the first time Electrum messed up, and it probably won't be the last one. The good thing is that they patch exploits quickly, but this could have been prevented by simply disabling links from the very beginning....