Well I don't know if it's because I'm not as picky or easily perturbed, or because I am just oblivious and emotionally repressed and should have felt much more disappointed and angry about this...but the fact is, I didn't think it took anything at all away from my time at MK a few weeks ago.
I can't explain it to those who haven't been there, and to those who have and are much more sensitive to issues I consider to be pretty trivial, I can't convince them otherwise...but in person it just isn't as bad as it's being made out to be. Again, to ME.
I noticed, or registered, maybe 3 of the tarps/refurb areas after spending the whole day in MK. I was aware that Space Mountain was closed, and it wasn't 'tarped', but TTA was boxed in. That was not unexpected. I did notice Hall of Champions' tarp on Main Street - but thought it was cute how they blended it in with the images of the building on the tarp. And I remember Ye Olde Christmas Shop being walled and tarped, again with building images. They didn't really bother me. I spent a lot of time in Frontierland and Adventureland, and didn't even notice Diamond Horseshoe or the roof tarp...I guess I don't give much look at Diamond Hoseshoe anyway. The area being refurbed around Pirates escaped my attention too - I guess because while passing through that area, most of my attention tends to be facing towards Pirates and the Caribbean Plaza. It just didn't register at all. I had lunch at Pirata Y El Perico, and everything looked fine from there. Tom Sawyer Island looked normal, Big Thunder and Splash Mountain looked normal. I didn't notice the train station, but then I didn't go there this time. Haunted Mansion and the Liberty Square area looked fine, with the exception of the Hall of Presidents tarp, which I didn't include with the others since that was also known and expected with the Presidential change. Admittedly, I didn't go through Fantasyland from the Columbia House underpass side, therefore never walked past Small World or Pinnochio Haus...I went through the Tomorrowland side, and then past Snow White & Dumbo to the castle...nothing looked out of place there.
Much will depend on the following factors:
How sensitive a person you are
Which sections of the park you spend the most time
How much your trip was dependent on a particular attraction or building
How rare or infrequent your trip is
If you need everything to be perfect - you'll be disappointed. If you spend a majority of your time in Fantasyland and Main Street - you may find it looks worse. If you absolutely make your trip just to go on one of the rides or see one of the buildings that is tarped - it will hurt your trip. If you're going to Disney for the first time in a decade, and may not get back anytime soon - the tarps definitely take from the experience.
I'm lucky in that I'm not sensitive, spend a majority of my time in Adventureland and Frontierland, don't really go to the park for any particular ride or attraction (I've actually spent the day in MK without riding a ride), and I go up there extremely frequently so I'm used to seeing refurbs and know I'll be there again in just a few months.