I really don't want to be pushed into defending Congress here, but personally I want my elected representatives to be able to make it to/from DC reliably to be able to vote on my behalf, while also still being able to work with/meet with constituents in their home districts.

You either make unpleasant aspects of the job (like commuting to DC on a weekly basis) bearable, or you give in to the mob that wants to make the job so unbearable that only the worst of society wants to serve (and even now we're still headed in that direction).

Again, the perks pale in comparison to what people think they are (and are definitely inferior to the executive branch, where senior officials and flag/general officers regularly use government aircraft and helicopters for questionable purposes at a much higher cost to the taxpayer than a member of Congress on a commercial flight).