I'm not sure what you're remembering or if you may have misinterpreted something, but it has always been the official position of the site that we would be interested in participating again.
When we ran the previous survey the site was actually in trouble financially and wouldn't be here today otherwise. Since then we've been working to improve things, but still aren't where we really need to be to ensure long-term survival. These sponsored surveys are an excellent way of boosting the site's income with minimal hassle to our members, and we would much rather run them when the opportunity arises than have to try plastering more ads around the site (hell, ideally we'd love to have a lot less!) or other more intrusive methods.
Due to the urgency of the situation with the first survey we did make use of a full-screen interstitial directing members to the survey, and that's something we do want to avoid unless absolutely necessary.
If you have any specific feedback about things we could do to make any future surveys less intrusive (remembering that they do need to be highly visible to do us any good!) or more palatable for you please do speak up though -- unfortunately we have limited control over the surveys themselves, but we can at least take on board anything that might be possible from our end, and pass on feedback to the company who runs the surveys.