I suspect that this is a feel good Bill without harm. Although it is clearly all about politics, I see no downside in supporting it.
The federal government has a good track record of getting back pay to furloughed employees upon resumption of normal activities, and I have no reason to expect that this time will be different.
The Democrats want some symbolism to show that they care more about our citizen, thus another feel good Bill. Of course, voting against this symbolism would make anyone appear like a bad and or callous mean spirited person.
A better idea might be to stop playing politics and approve the President’s ask for funding passive physical barriers and other measures to protect our southern boarder. Building the required security on the border is a far better way to demonstrate that you care about our citizens.