I've owned about 4 Nokia phones. I can't remember all the number names for them but I did have an N series. I had the N73 (image below) and while it was pretty good, it didn't seem worth the high price tag. There was also a load of bugs with it and wouldn't do what I wanted it do half the time. The only thing I thought was fantastic about it was that it had an INSANELY loud speaker for some reason. Some of my other friends had an N73 but my speaker was a lot louder than their's. It was awesome haha.
Plus the Nokia phone I'm using now has a few bugs. Whenever you try and search through your contact list by pressing a letter like 'N', then it will just freeze for a few seconds and close the phonebook. Meaning I have to scroll all the way to the contact I want to call.
Plus I've always found Nokia's so damn confusing. The thing I like about the iPhone is that I understand how everything works, it's simple and they have nice big shiny touchscreen buttons for people like me
Edit: All the programs on the iPhone load so quickly it doesn't matter. They'll literally open as soon as you click them. Besides, with a phone you can only really do one thing at a time anyway. It's not like a computer where your doing a bunch of things at once.