This is one of the oldest tricks in the book, but it doesn't mean it is less effective. If you are in a hurry, you can easily overlook that the pasted address is not your intended address.

I don't think manually entering the address is an efficient ways to prevent such an attack. If you often make a lot of transactions, it can be a tedious job. However, for larger transactions, even that is possible.

A vanity address (I have no idea if Etherum has vanity generators, probably yes) is a nice thing to have to counter this kind of attack. You cannot miss noticing that your address has changed.