The Republicans didn't opt out, the Democrats did. The cadillac plans are the ones with little or no deductibles or co-pays. The Republicans introduced an amendment requiring members of Congress to use healthcare from the Obama plan. It was voted down by the Democrats. To be fair though they knew before they introduced it that it would be voted down.
If you want to keep paying for your current plan you may choose to do so.
That sounds good but my plan won't be around for long. I don't agree with the way insurance companies set their rates but with the new rules in place now you can bet everyones insurance rates are going to go up in the coming years, a lot. In the end the federal government will be the only source for health insurance.