I wonder whether I could use "see eye to eye" when I agree with someone spontaneously like this,
" I see eye to eye with you"
or when I disagree with someone
" I don't see eye to eye with you"
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looking at contemporary uses of this idiom in COCA (corpus of contemporary English), almost all uses are with a plural subject i.e. not "I" and without a preposition.
He and Bitsy obviously didn't see eye to eye about that.
She liked that they could meet eye to eye
she and David were eye to eye.
it's a well-known fact they are groups who don't see eye to eye.
In conclusion, it's not correct to use the idiom with the preposition "with" and "I" as a subject alone (or it's not a common use at least) as in the examples you've provided. It's best if you say "you and I don't see eye to eye" (plural subject, without a preposition)
source : https://corpus.byu.edu/coca/
*note: saying "you and I don't seem eye to eye" to someone, might sound a bit direct. you might want to soften a bit using I guess or I think, this way you won't come off as rude or curt. I don't think You and I see eye to eye or you could say something like :
"I'm not quite sure about that (what you're saying)"
if you want to say that you have a different opinion or you don't agree with what they say.
"let's agree to disagree
this is also a respectful way of saying you don't agree with someone's opinion on a matter
This expression is generally used in the negative- "don't see eye to eye".
It is generally used with the two parties as the subject, rather than a single subject and a with-phrase for the second party:
Tom and Linda don't see eye to eye. - normal
Tom doesn't see eye to eye with Linda - less common
It's a way of informing a third party of a situation, so you wouldn't use it with you as one of the parties (they already know). You might, however, use it with you to form a rhetorical question:
You and Tom don't see eye to eye, do you?
If the speaker is one of the parties, I will be the second party- as in any other and-phrase that includes the speaker:
Tom and I don't see eye to eye.
It tends to suggest that there are far-reaching (for example, ideological) differences of opinion between the two parties, unless you add an about-phrase:
Tom and Linda don't see eye to eye about sending James to public school
It is often used in a euphemistic way about a disagreement that is quite deep-rooted and emotional.
For the positive situation with a specific subject, it would be better to say
I'm with you
I'm with you on that
For the negative, you could say
I'm sorry, but I don't agree with you about that
I don't agree with you
If you have a lengthy discussion and cannot reach agreement, you can finish it by saying
I think that we're going to have to agree to differ.