Ctrl+F still brings up the Find Object dialogue box in S20 just as it does in S10 and, as far as I have noticed, works in exactly the same way. What is currently still missing from S20 is the Ctrl+Shift+F Content Search Filter - but that may eventually be added OR the Asset Palette Filters may be the better option.
Duh! Why didn't I think of that! I think I actually had my fingers over the keys and thought 'That's not going to work'.