Zelda 1 is my favorite, easily. It communicated the idea of a large, vast, magical world far better than any of the current iterations. I still love the current ones, of course. There was a dungeon in Wind Waker (Earth temple maybe? It's been so long) that absolutely SCREAMED old school Zelda 1 inspiration. I was floored at how amazingly nostalgic it was.
Everything else after 1 seemed so confined, which the exception of 2, which I (for a while) held as my favorite game ever, and I think it gets a harsher reputation than it deserves. After several years and getting older, I realized 1 was the superior game, but 2 still holds a soft spot. I think that everyone who hates 2 never finished it, either because they got bored or they couldn't. It really held up very well and greatly expanded the overall universe of Zelda, whether anyone wants to admit to it or not.
LTTP felt a little confining, even with the Dark World. Link's Awakening I like, but I don't see the big monster attraction to it. To me it felt like one of those games I played because I felt like I needed to. It didn't leave a lasting impression at all.
Haven't played the Orcale games or Minish Cap.
Ocarina is beautifully executed, and I think I might replay it soon on the GC. Same with Majora.
There is a definite distinction between Zelda 1 and all the others. I don't know if it is simply that Zelda 1 was the first one I played that causes it to have this lasting impression that it is larger than the other games, or if it really does feel, in a raw sense, larger. I guess when you've got two areas that require you to navigate them precisely, hidden rooms in dungeons that don't even appear on the map, waterfalls to walk through, and a huge assortment of items, it leaves a big impact on a young kid. It might honestly have to do with the fact that Zelda 1 is so open. I think part of that was recreated with Wind Waker - I know I sailed around for a long time without doing anything worthwhile, which was terribly amusing.