第一句是一个虚拟语气，would you rather后面接了一个假设的场景所以visit用了过去时
第二句是把hardly提前了，相当于I can hardly see anything here，看情境可以起到部分强化语气的作用

一般would rather后面加动词原形

缺了动词

would you rather + she visited us tomorrow？
would you rather (have that) she visited us tomorrow？

“Would rather that” uses the past tense to express desires, regrets, or assumptions about something in the past.
表达愿望/惋惜/假设。事实是
she didn't come.
是虚拟语气。