I can't say for Harris, other than she seems like a shittier Hilary. So that would make her some dumb moderate who chases popular opinions.
But, Biden is most certainly(from his voting history) in the conservative/moderate camp.
What exactly are you terrified of? The empty gesture Equality Act? Whatever manifests as some sort of bullshit Green deal(which will most likely be toothless)?
The possibility of packing courts? Something he said he wouldn't do. On top of the fact the dems aren't unified on that issue to begin with(they probably couldn't get enough votes for it within their own party).
Biden is about as 'stay the course' as you can get. Unfortunately that course is heading for an iceberg, but it's not changing anything. It's just continuing bad policies...
Bad policies perpetuated by both parties..
Don't get me wrong, Biden fucking sucks. But, lets not go down the 'Obama is a communist" road...