Ok a few things. If you are supporting correctly you will not have the 'least impact' you will have massive impact in game. Maybe in some cases a good support is the unsung hero and MVP. The game is not all about kills its about objectives and team wok, not any other single champion embodies those 2 ideals more.
If you play tanky or what I call off tank support. They are re working tanks soon. And some stuff like knights vow and the fact face of te mountain bubbles you both, and other great support items can keep is very fun fresh and interesting.
The only time I grumble buying a sight stone is on a pure caster like Lulu or Lux. I am not a fan of that other thing, I want my utility of my Frost queen chain... If you feel this way buy a control ward now and again and upgrade the free ward. Many abilities also can reveal an area like Lux illumination. Your role however is, SUPPORT
Babysit.... ? This is literally the role you have accepted. Your whole job is to see that ADC and your team to victory. If this is not your cup of tea maybe you want another role? Id rather see a bad 'any other role'' than a trolly and disgruntle support.
Its not about being MVP or doing damage....all be it some supports can REALLY hurt a teams damage like new new new rakka is... ehhh... if played wrong really can hurt a team.
Also you are not always getting a kill. (scrolling down) its like jungle people think every visit by jungle should end in a lane kill its just not true. it can be a push back or to scare them back or to get them to burn a flash, or it can be to hold lane while you back. Support is the same. your job is lane control and prevention. Not every ward you drop is going to lead to some big play.
I only recently started using void after playing since season 1 it can help on random public games when you dont know who you are partnered with.
and scrolling down more maybe you are bad at it, you may just have no love for support. so.. dont do it. I would not want a support that felt that way.