@SilverBirchTree, thanks for your support!
Some really interesting replies on here, as I expected. My question of AIBU? was a genuine one - I am interested to hear what other people think on the topic and it absolutely wasn't my intention to criticise those who use these products.
When my very environmentally-aware DH first started to complain to me about the amount of plastic I used, my first reaction was to become defensive and make comments like some of the pps. Nobody likes to be told their way of living is incorrect or harmful. I certainly wouldn't describe myself as an eco-warrior, but am definitely undergoing a change in the way I think about my consumption. It's much more effective to reduce than recycle.
The plastic is needed Is it really, though, in all cases? Have you thought about it critically? Why is the plastic needed, and just how much of it is really necessary?
So don't buy them I don't. But as a couple of pps observed, my own plastic use probably doesn't leave an enormous footprint, so a change I make on my own, quietly, isn't going to make a difference. But if just one person thinks more about their plastic use as a result of my post, and tells one more person, then we have the start of something.
My beef, really, is mostly with the manufacturers who needlessly cover everything in plastic. I have a scientific background, so I am well aware of the need for sterility and the benefits of metallicised films and blister packs. Some plastic use is essential, there's no denying that.
I am, as a previous poster somewhat patronisingly observed, fairly new to all of this and what actually prompted my post was the delivery of my 'internet cheapie' ovulation and pregnancy tests. I'd ordered them after becoming concerned about the amount of plastic on a shop-bought pregnancy test and was quite taken aback at how small the tests actually are are! Surely we don't need that much plastic to cover a tiny little stick. Judging by the number of posters who crack them open to get a better look, I'd say the plastic cases are in fact more of a hindrance than a help!
Finally, to address the comments about not having children if you are concerned about the environment. You are absolutely right, and it has taken a lot of soul-searching, particularly on my DH's part, to even start thinking about conception. I'm still not sure it's the right thing to do for our world but if we do have children, they'll be environmentally-aware ones, at least.