But I don't have "smart" TVs.
I have a NOW TV box, which you can pick up for £15 or so.
The website is hideous, but the box is great.
Based on Roku, it's a hockey puck with Ethernet and WiFi and only connects via HDMI.
It has an app for YouTube, as well BBC iPlayer, ITV Hub, All 4, Demand 5, Free Speech TV, VEVO and Vimeo.
The version of BBC iPlayer is the best one I've used.
The YouTube app allows you to log in to your existing account.
Of course, there's a catch.
NOW TV is owned and run by SKY TV, so, yes, it only costs £15 in the shop, but when you set up the box, it will ask for your credit card details.
That said, I have had the box for 3 years now and not paid a penny.
If you enter the NOW TV or SKY Sports apps, and see something you like, you can try to play it and you will get a dialog prompting you to buy a Pass.
It's a deliberate act, which is to say you can't 'accidentally' watch paid content and you won't be tricked into doing so.