This is still the case.
My TV still takes about 20 seconds or so to boot. I suspect it's doing POST. It is a quite-recent box with internal tuners and such so it's not as though I have something obsolete and CRT-ish.
My Samsung tablet boots faster. My Wintel HP notebook is *lots* slower but that has the additional burden of AV-ware to start up.
In my house, I don't think I have *anything* that is instant-on. Even the lights are mini-fluorescents and take a while to warm-up.
Oh. Gas hob. Okay, I do have one bit of kit that starts as soon as I hit the "switch". Interesting that the oldest tech I have starts fastest.