Riker wasn't worried, he was pissed. LaForge asked Troi to come along because he knew it was about to hit the fan with him personally, so him being worried would be accurate enough.
Barclay did screw up by falling asleep on the holodeck and not showing up to work. No question about it. But if you're on your computer playing video games and lose track of time, that doesn't give your employer the right to break down the door and access your personal computer to find out what you've been doing.