I mean, I don't think it's inherently obvious that a triangle pointing to the right means play, a square means stop, and a circle means record. However, it didn't take cassette players and VCRs to be out that long before everyone knew what they meant. In that case, I think having more info (like the text 'Play') is unnecessary.
In the mobile space, I feel like there is pushback because it's also not immediately apparent that 3 horizontal lines means "menu". I wonder how long that will be the case, though.
Or even worse, make the common case harder just so the interface can include all the features.
It's generally a good idea to look through the settings or search on the internet if you don't like something on your PC.
Windows 7/8/8.1/10 all allow using labels and text for the taskbar buttons.
The other real irritation comes from the fact that the selected button no longer has a "pushed in" effect like Windows Classic used to have, but only a very subtle colour change (and the colour varies depending on the colour of the icon too... so instead of just one "active" colour for everything, I now have to figure out what each app's active colour is to find it quickly):
http://answers.microsoft.com/en-us/windows/forum/windows_7-d...