That's a big assumption. The "ruling" party is already attempting to circumvent some of the rules and conventions of the democratic process. The end-around attempt on the judicial filibuster being a good example of this. Fortunately that got shot down. Grid-lock is a good thing at times, it ensures that the government doesn't do anything too stupid. If the roles were reversed, and the Dems controlled all three branches (God help us...), I doubt you would have the same opinion.
"The end-around attempt on the judicial filibuster"? Hmm, could you explain what you mean by that because the filibuster to me has always seemed like an attempt to circumvent the normal governmental process... I mean, look at what it actually is.

Also if the dems controlled all branches of government I would certainly be against it but I wouldnt advocate giving republicans power they didnt earn.