I use copy/paste all the time on my Treo 
I'm an Apple fanboy, but the lack of copy/paste is a big impediment for me and one of the reasons why I'm waiting to see other options like phones on the Android platform, Blackberry Bold, or phones based on the new Palm OS II to come out next year.
I use copy/paste at least 2-3 times a week for friends who ask me to text them something that I have elsewhere on my Treo (often a phone number from my Contacts, and no I'm *not* going to memorize it ;-) ), and I copy and paste it and send it off as a text message. I would get quickly aggravated if I could not do this on the iPhone.
That being said, this first Android phone is fugly; I hate the slide-out keyboard design and I'm sticking with my Treo 755p for a little while longer as I'm addicted to physical QWERTY keyboards, but not ones that I have to slide out first to access.
Maybe I'm just using it wrong, but I've never had the need for copy/paste on my iPhone. I find all the vitriol thrown around about its nonexistence a bit disproportionate with its potential actual use in real-life.
/my humble opinion
I'm an Apple fanboy, but the lack of copy/paste is a big impediment for me and one of the reasons why I'm waiting to see other options like phones on the Android platform, Blackberry Bold, or phones based on the new Palm OS II to come out next year.
I use copy/paste at least 2-3 times a week for friends who ask me to text them something that I have elsewhere on my Treo (often a phone number from my Contacts, and no I'm *not* going to memorize it ;-) ), and I copy and paste it and send it off as a text message. I would get quickly aggravated if I could not do this on the iPhone.
That being said, this first Android phone is fugly; I hate the slide-out keyboard design and I'm sticking with my Treo 755p for a little while longer as I'm addicted to physical QWERTY keyboards, but not ones that I have to slide out first to access.