In the new series, the control room of the TARDIS took on a slap-dash design, to give the impression that The Doctor had patched it together with any bits of technology he could lay his hands on at the time.
That look faded away a bit with later redesigns of the set. The console still seems to have what look like earth technology mixed in - keypads with English lettering, etc. but it looks much more like a single design, and not a patchwork.
There's an idea initially introduced in (and later cut from) The Doctor's Wife that explains the "junk" aspect of the design. An important scene in the episode features The Doctor and Idris building a TARDIS from what looks like complete junk from literally anything they could find laying about. (This was done to work in the winner of a "Design a TARDIS" contest from British children's show Blue Peter) A scene that got cut explains that what they see is not junk and rubbish, but parts of destroyed TARDISae, still under the effect of their chameleon circuits.
So it's possible that the "junk" look of those earlier control rooms (and certainly the one banged together in that episode) was simply that - a look. The chameleon circuit was disguising the various jury-rigs The Doctor made over the years, randomly disguising a disused Bambleweeny 57 sub-meson drive as two clothespins and a bit of string. POssibly because that's what she considered them no different from, or no better than.