On the actual RTW yes you will get questions from most countries (USA, UK, Australia etc). This is because immigration will be able to see your entire itinerary. You might get a few delays, but wouldn't let it stop you. Just be honest.

I had a Pakistan visa in my passport for quite a while from my visit in 2006 (new p/p now), and never really had too many problems. A few questions here and there. I also had Iran in there as well come to think of it.

It's a big country and MANY people go there, so don't worry about it.

Having said all that, my former employer MADE me get a new passport in late 2007 because of my Iran and Pakistan stamps (didn't want me to get refused entry on my various work trips to USA, and said if I did, I'd have to foot the bill for the ticket if I was refused.... ). So your paranoia is quite common it would seem.