I wouldn't call it seamless, but when trying to snap the Xbox party tab or achievements the game finished before the simple interface does.
PS4 interface is far from perfect, but it beats Microsoft's playground windows 8 kiddie pool interface.
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In comparison I'd call it seamless most certainly. You press the home button, you go home automatically. You "join party" you're in immediately and then back to gaming. The web browser easy and quick to use, console powers off when you want it to. Controller battery life seems to last longer. Store purchases easy to make and start using when ready. I'd take this smooth and simplistic interface over this Microsoft crap any day.
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Not so sure about the controller battery, but I agree on everything else. Hate the xbox interface.