Until 2012, my polling place was at a Catholic Church. It was actually in a detached building, a banquet hall for the church or something, around the side from the sanctuary. The first time I went there to vote, I tried to enter the sanctuary, thinking that was where the voting took place, but a kind priest was stationed there, directing voters to the other building.
In 2012, they moved the polling place for my district to a Baptist Church. They actually set up in the lobby there, but I have not noticed any overt Christians symbols when I went there to vote the last two times. For the most part it seems to be the same group of people working the polls, so I don't think they were drawn from either the Catholic or Baptist congregations.
It hasn't bothered me at all. No one proselytizes to me when I go in to vote, and the new polling place is actually much more convenient for me than the old one. It is not the case of government promoting a religion, as these two polling places have been from different religions, and there are other polling places in my county that are not at churches (there is a polling place in the county court house as well). It seems to be more of a case for a convenient, large, and easily accessible place to vote.
I assume this is only because I live in a Democratic county in a Democratic state, and if one or both of these were Republican, then I would have to follow a dirt road to the most inconvenient location in my county, with no parking lot, where I would need to present 3 forms of photo ID, one of which must be a firearms registration card (I do not have to present any ID to vote), and then wait in an hours long line to vote in a closet with video cameras covering every angle.