EvieBear, I understand your thinking totally. DS was 14 months old when we got married, and he stayed with my mum while we went on honeymoon. We had been engaged for 2 and a half years, and had booked the honeymoon while I was still pregnant. Never having a baby, I thought 14 months is not too bad an age- too young to really miss me or remember, but old enough to be without me. I also left the honeymoon to DH to organise as a surprise, with everyone knowing but me until about 2 months before the wedding.
I worried about it every day on the run up to the wedding. DS is pretty chilled, spends one day a week with my mum when I go to work, and never cries when I leave him at nursery (in fact, now waves and shouts 'Bye!'). But I worried myself silly about it. Whenever I told anyone that I was worried about leaving him, I kept getting told 'Go away and enjoy yourself, you won't get this chance again'. DH and I have never had a holiday just the two of us, so I was inclined to agree with them. So we went away on our honeymoon, and I missed DS like crazy every day. I found myself staring at other babies on holiday like a crazy woman, wondering if they were the same age as DS
I'm sure one woman at breakfast thought I was a bit crazy, I was tempted to go over and explain. The first week was bad, but I could kind of deal with it; the second week it got to me quite bad. I found myself crying when I saw other babies, and I am not usually someone who cries too easily. It ruined the holiday for me that DS wasn't there with us.
Looking back now, we should have had a couple of days on our own, and a little holiday with DS. When we came back, my mum met us at the airport with DS (the last few days of the holiday had just turned into a countdown to DS, by the hour). I took him and hugged him, but he turned to my mum and wanted her. It broke my heart :( He came round after half an hour or so, and settled back into his routine that night, like nothing had changed, but like I said, he is a very chilled baby where pretty much anything goes!
I would think very hard about whether you have spent any serious time away from DD before. I had only spent the odd night away from DS before we went away. And even then, I ask for regular updates and picture photos. You can't even get that when you are abroad. Even still, I managed to rack up a £120 phone bill from when we were away texting my mum and asking what he was wearing; what he had ate that day; etc! I have never in my life missed anyone or anything like I missed DS for those 2 weeks.
HTH.