You're completely correct in saying they are still growing, but so has the other extremist party, the protestant DUP headed by Ian Paisley. It shows that even in the absence of active paramilitaries the two communities are more polarised than ever.
I don't happen to agree with your assessment that Sinn Fein are doing better without the IRA, as I said above, it seems like catholics are becoming more extreme. I could be wrong of course !!
Here is a story from the BBC today.
http://news.bbc.co.uk/2/hi/uk_news/northern_ireland/4154657.stmPolice say IRA behind bank raid
The IRA has been blamed for the multi-million pound Northern Bank raid in Belfast.
Chief Constable Hugh Orde said that organisation was responsible after meeting key members of the Policing Board on Friday.
The Northern Bank has now reassessed the amount stolen from its head office on 20 December as £26.5m.
The IRA said it was not involved in the bank robbery and Sinn Fein leaders have said they believe the denial.