Thanks for looking at my suggestion.
I suggest you add a poll or survey capability to Confluence without needing a plug-in. Polling is a basic, basic component of a collaboration suite – which is the basic premise of using Confluence – and that should be part of the regular package.
Plug-ins are great, but they can shift around and require IT/management/etc. involvement.
Polls should be there if Confluence wants to claim being a top-tier collaboration tool.