It's certainly not necessary, but it is a handy device to own. I almost never use my laptop since I got one. That being said, since you already own an iPhone, the two work well together. Via iMessage, I can send or respond to most text messages on my pad, and if I want to, I can answer phone calls without ever touching my phone. Not that i ever do, but if I wanted to, I could.
As an Internet browser, it's my main device. And using my Apple TV, I can send any videos or pics to my television.
I rather enjoy it, but none of these devices are a necessity.
I agree.
I'd like to get Apple TV. I am waiting for the Apple TV refresh that hopefully will come out in 2015.