Actually Hye, Trigger Zones actually do effect everyone in the level sorta of. If the server host touches a trigger zone then everyone will get affected by it, except the people who were in the server before the touch. Although, if people joining the server touch a trigger zone, no one will get affected by the trigger zone.

You can build a simple small sucker tube ride placing trigger zones with their id in the coaster, don't type anything in the trigger zone options, except the TriggerID. Therefore when everyone goes through this coaster including the server host the Trigger Zones in the level will not affect anyone when the host touches a Trigger Zone.