I dont use minor aspects with nodes and certainly not transitting nodes. They are not valid. They are points in a natal chart that belong to the person born on that day only.....and are not after all planets or fixed stars. The orbs are smaller than with planets and I use only conjunctions and oppositions that are tight.
ASC, Black Moon Lilith or Part of Fortune are also only mathematical points, but in my experience, their transits can be felt.
It may also be a matter of how sensitive is one to transits generally, for example, I am very sensitive even to short, passing influences (Neptune in 1st, Moon trine Neptune, Merury in Pisces conj IC) so I actually feel when transiting Moon squares my Sun (it´s likely that I won´t feel too well), opposes my natal Saturn (then I would be in a "leave me alone" mood) or transiting POF or ASC on my natal personal planets.
These are transits that occur every day. Nodal transits or transits of BML are much rarer and are felt as well. BML transits, for me personally, usually had to do something with sex or some power issues either in myself or others. I cannot give you any "proof" because everyone has to decide for themselves. I just know that it works for me.
When my son was born, transiting South node was conjunct my natal North node (and vice versa). This of course doesn´t happen to everyone when their child is born and there were also other indications of an important events, both in transits and in progressions, I agree with Dr. Farr that there are always several influences in any event.
I kept a diary when I was in my teens and just looked at what happened when when I had a Nodal return at the of 18. When I was 17, I fell in love with a guy and he liked me as well, but we never took it any further, because we had problem communicating. I was sad because of it and blamed him for not behaving like I would like him to be and I actually questioned whether he liked me at all. For that day (the nodal return), I wrote in my diary that "
today, out of a sudden, I realised that I had a large role in our separation because I thought it was up to him to do something about it, to approach me the way I wanted and I took it for granted. I guess I made it really difficult for him. It was me who had too big expectations and it feels relieving to know that so I won´t do it ever again. I won´t no longer blame anyone for something that I am responsible for as well."
My natal North node is in 8th house ("letting go" of "emotional attachments") and I had to let go of him.
So you see, it doesn´t have to be any big event, it can be much more internal (but when I look back at it, you realise that it had huge impact on my personal life).