Test equipment is also so much better and more accessible. My multimeter has been annoying me (it takes *six* AA cells!), so I got a combination multimeter, signal generator, and oscilloscope for under $75 shipped. The oscilloscope part has limitations, but it’s extremely capable for the price. 50 MHz bandwidth on each of two channels, Y-T and X-Y modes, the ability to do math on the two signals and show the result as a third trace, live FFT, the ability to save a waveform for later viewing on a computer, all kinds of stuff.

Logic analyzers have also gotten really good and really cheap.