You know, as a support main (although I'm new to the game) I have to agree with this 110%. As support, my main goal is to keep the ADC alive, and to get them the pentakill. I don't feel underappreciated at all, because the ADC always gets incredibly excited when they that pentakill.
To stay relevent, the issue you are experiencing is due to an ADC who doesn't trade. If they do not trade, they will overextend, and you can assume they have no clue how limited you are as a support. I have found that bot lane usually works best when they play synchronously. By this I mean both players poke when viable, both back when necessary, and both request jungler when the opportunity not only arises, but is in the teams best interest.
Lastly, as a support I have learned that it's very easy to focus on bottom lane and only such. I have had to force myself to ward very early on, pay attention to top and middle lane to see if my jungler may be able to help me out, as they are kind of like ADC's back up support early game. As soon as you look away from that minimap,
comes up out of NOWHERE, and your 5 minutes, 1,000 cs lead has turned into the enemy dragon lead. Which, as we all know, translates into...
"Support, you suck! Why didn't you ward?!"
"OMG ADC STOP OVEREXTENDING"
"Where the F*** is my jungler?!"
This is a somewhat unavoidable issue, but hopefully my input has served some sort of positive purpose.