Unfortunately it's a start from scratch also with the plugins as they are incompatible. The number of plugins are still very limited (...and we still/again suffer from the "dispersity problem" with plugins popping up without people knowing how to find them, but there is a "community plugin aggregator" that does help). However, regarding the limited number of plugins, TW5 itself is more powerful than TWC and it's easier to create your own filters... ok, not easier than installing a plugin but easier to set up than it is in TWC.