OK, I will explain something in this update. I'm not jealous, because the other person I mentioned in the OP is me. I didn't want to talk about myself, so I mentioned what happened to my sister.
The gift giver in my case is not my SO, and the surprises aren't Vacations. They are big and medium ticket items. This person IS controlling, and I feel that the "surprises" are another way to control.
I've talked to her about it many, many times (this has gone on for YEARS). A lot of times I get a hint of what she'll do and I tell her to please not buy the item because I don't need it/have any use for it/live in a small apartment and I just don't have the room. But she will do what she wants and, SURPRISE! "see. you really needed it/have use for it/room for it! (no). Then I just have to grin and bear it as not to hurt her feelings. I've talked to her about it over and over again, to no avail.
For example. I have back problems. I've bought pillows here and there which help me to be comfortable in my bed. They don't match or look pretty, but it works for me. So she tells me "I want your bed to look like a magazine" Me: why would you? You know about my back problems, and the bed is just perfect for me. She: But it looks so ugly! Me: So what? Please, if you are thinking about changing my pillows or anything on my bed, please, please don't.
She gets upset, and later on she tells me "Oh, I've found the most beautiful Bed in a Bag!
It's gorgeous, and I KNOW you would just love it!
So I tell her that I already explained why I don't want it, that during the day I lay down sometimes to stretch my back for a few minutes. The last thing I need is not to bee able to stretch my back or take a nap in order to keep the bed "looking like a magazine". Again I ask he to please not buy it for me.
This conversation happened just before I posted. and I guess that's why I went off and talked how surprises make me nuts.
I want to add that I love this person dearly, and she has many wonderful qualities...but the controlling is driving me NUTS.