It's been a while since I used v3 as I've had early access to the beta.. but from what I remember yes, the whole system is even more easy to use, there's a built in animation tool which is awesome, pre built "blocks" to speed things up, faster and leaner...etc

I'd say if you're going to rebuild your portfolio then its a definite yes, but if you're happy with your current one, you don't need to upgrade right away