I ran an ethernet cable out to my workshop so I'm fully interneted up. I was using it to watch TV off a server in the house, but I've now got a Chromecast so you can bounce youtube instruction videos from my phone to the TV. But recently my PC and surround system were kicked out of the house, so that drives three monitors, a TV and a projector. It's 7.1 surround sound, so a really good setup for watching films, F1 and Football.
WiFi, phone charger, burglar alarm and fire detection linked to the house alarm system, sink, electric water heater, hand towel, soap, swarfega and barrier cream dispensers, a classic car and I have a 6 monthly subscription on Amazon for a 2kg box of Midget Gems that I keep out there. I don't think any of these things are essentials, but they make it a much nicer place to potter.
I definitely agree about cupboards rather than shelves, to save on having to dust everything all the time. I'm slowly converting all my underbench cabinets to drawers to maximise storage and to keep the dust out too. I've got 5 work bench spaces, rather than one or two large benches as it stops projects from spreading and lets me have several thins on the go at the same time, I find that helps a lot with spending less time tidying and moving things around. These are a woodwork bench, metal work bench, a bench for my bikes and classic car jobs, a wall-hinged assembly table and a spare bench, that is doubled up as a desk at the moment, but eventually the PC monitors will lift up behind a cupboard out of the way to make that more useable.
I don't have a fridge, but I do have two freezers, one is full of beef, the other a mix of frozen fruit and cakes. It's useful to have a frozen battenburg to hand when motivation is ebbing I find! I do need to add a kettle, but it's no hassle popping into the house for me.
I replaced an uneven concrete floor with a suspended wood floor with vinyl over the top, that's made a huge difference to comfort, the thing I'm really missing at the moment is some heat in winter, but there's not a lot I can do with that without insulation, so that's a while off.
But, of all the replies, the best one is time, I'm sure we'd all like a bit more of that!