[you]: Yes. If only because the alternative was unthinkable.
Large numbers of delegates to the ratification conventions voted against ratification, so it was not unthinkable. In New York's case, the final vote was 30 to 27, but there were seven or eight Anti-Federalists who abstained in that vote. They were willing to let the convention ratify the Constitution so long as the ratification document had all the clarifying statements about what the Constitution meant, such as the reassumption of governance statement, a statement that the people capable of bearing arms could bear them, and various other clarifying statements.
It's true that folks from several states, north and south, had reservations about 'joining the club'. Those reservations are memorialized in their writings and records of their debates. The unthinkable alternative that I spoke of was the proposition of of trying to go it alone. No single state had the strength to do so - for very long at least.
There wasn't a single state - even the hotheads in South Carolina - who didn't realize that going it alone was a death sentence for their communities.
Several of these states chose to include 'signing statements' like you mention in their ratification declarations. They are very nice, often well spoken, and not a one of them had the force of law.