There are services designed to allow you to think up new email addresses on the fly, with no setup, and still have them delivered. I personally like https://www.spamgourmet.com/ - you can create an identifying address on the fly that also limits the total number of emails you'll receive from that address. It solves all the issues you mentioned - it's frictionless and still allows replies, while preventing spam. The gmail '+' feature works too, but is so high profile that a lot of spammers know how to parse it.