Precisely. Pixel clocks in van Eck's day were perhaps a few MHz, and the image was displayed by firing a modulated electron beam at a sheet of glass (i.e. a lot of power being manipulated in a fairly unconfined manner). Modern displays can have pixel clocks above 1 GHz, the amount of power being switched is much less, and that power is used in a very small space (the thickness of the LCD). Even given that receiving technologies have improved as well, the odds are against the eavesdropper.