Yes! I thought it was just me, but I have definitely seen a significant increase in the amount of ads at the start of almost all videos.
I only subscribe to a small handful of channels; EEVblog, bigclivedotcom, techmoan, 8-bit guy, ashens... and I fully understand they get some (or the majority) of their income through YouTube advertising. However shoving unwanted advertising in my face will only make me find a way to ignore the product/service they are promoting entirely and block it. I have never clicked on an ad and overt advertising does not have a positive effect on me.
Thankfully, Ghostery and Adblock Plus do a pretty damn good job of removing all advertising from my web surfing experience.
Also, why should Google and other advertisers profit from the hard work of those who contribute content either entirely funded out of their own private income or by those (such as Dave) who make an honest living out of it? I prefer to put my money where my mouth is and donate either hardware to the channels I love, so in turn they increase their audience or contribute cash directly to the content creators via Patreon, Paypal etc... so I know exactly where all of my money is going.
EDIT:
I will add, that my methods don't work for everyone and I don't think there is one "right answer". If I may use our roads as an analogy: In Sydney, we have toll roads and non-toll roads. If everyone took the toll roads, they would be congested and no longer worth the cost. If everyone wanted to avoid the toll and use the back roads, they would be congested and no longer worth the saving. I think there is a balance (although realistically, in Sydney, you're stuffed either way). Bringing it back to my point: While User A's contribution be nothing more than watching an ad, User B might contribute in another meaningful way and User C might do nothing more but introduce Users D & E as regular subscribers to the channel.