ohclutter, no, not at all. They were 13, 15 and 16 when she was born and if anything it was a massive bonus to have them about. All three were (and remain) perfectly capable at helping out with her, changing, babysitting etc from the start.
I can only liken it to having one's first child really, but with the huge benefit of hindsight. One doesn't 'forget' what to do at all, rather remembers how little stuff is needed IYKWIM. DD3 was an exceptionally good baby largely because, I think, I went for the benign neglect form of parenting; ie I was very aware the she didn't need scooping up at the slightest squawk. As she's got older (she's now almost 4), I think she has benefitted from having much older siblings.
The only downside, if I can call it that, is that her and DD2 squabble! I have to shake myself in disbelief at times wondering exactly why my 3 year old and my 18 year old are arguing
.
If I had my time over, there is absolutely nothing I would change. I love having the big gap. The older three's early years are something of a blur tbh, 11 months between the girls, followed by 22 months between DD2 and DS. DS was also born at 28 weeks, so I have 6 months that just blurred past me.
IMO big gaps are wonderful, that and the babysitters!