Comparing...

When I'm in love, my thoughts are obsessed with the person and other thoughts are put aside.

I'm not sure about obsessed but when I'm [state possibly reference by the phrase "in love", and which I will represent by "X"] I do think about the person a lot, significantly more than anyone else in my life, despite not seeing this person with high frequency.

My thinking is distorted by baseless optimism. I fail to notice flaws in them I would notice with a sober mind, and when I do notice flaws I accept flaws I wouldn't normally accept.

I quibble with "baseless." When I'm X I certainly express great admiration for the person, bordering on a perception of perfection, but the individual in question has always been someone who is legitimately exceptional by objective measures. However, it does seem to a very strong halo effect.

Since being in love feels so good

Check.

imagining situations with the person when they're not around and of course nothing in those situations ever goes wrong

I'm not sure what sort of imagining you're doing, but I can relate to imagined conversations during which the person in question is impressed to the point of astonishment of some virtue of mine (my restraint, or my altruism, or something).

This creates unrealistic expectations.

I don't think so, but then, I've never desired to have a romantic relationship with either of my objects of affection. I have desired to be close to them and spend time with them. I'm not really sure what "romantic" is.

I plan my life with them optimistically way further than I would plan my life in any other regard.

Nope. When I'm X, I'm not doing an planning.

I can't properly analyze my mental state while being in love, since analytical thinking would likely end it and that's the last thing I want.

No again. I have distinct meta-cognitive thoughts. For instance, I feel like I will love this person forever, because that is entailed in the feeling, but I am also aware that I have no real way of predicting my future mental states and that people who are in love frequently wrongly predict the immortality of the feeling. I laugh at myself and at how ridiculous I am. My ability to maintain a clear outside-view does nothing to squash the subjective feelings.

None of this has any extremely obvious effects on my decision making: I wouldn't run off and get married for instance, because of that voice of rational meta-cognition, for example. However, It probably biases me in all sorts of ways that I can't track as readily.

I should also note that I might sometimes feel a twinge of jealousy, but release it almost immediately.

So...Have I been "in love"? It sounds like I've had most (?) of the symptoms? How is this any differnat form just having "crush" on someone?