If you are in a place where they are not almost bowing down to the donors, you're in the wrong place! 
Because they know fully well that you have something precious that you can decide to give or not give!
If you come across a person who is rude or not helpful in a blood donation site, you need to let the higher ups know about it. Perhaps that person needs some retraining and a reminder of just what a blood donor means to the whole process.
As someone who frequently
volunteers to do blood draws on the blood mobile, I really object to people going in with this type of an attitude. Obviously no one should be rude to you, but I think expecting the
other volunteers to be "bowing down" is way over the top. Spending a day receiving people with this attitude is the biggest reason nurses and lab techs don't like volunteering their (equally important to the "whole process") resource.
This is something you do to help your community and to maintain a blood supply for the population, including yourself. It is a generous thing do, but looking for extreme accolades takes something away from that.
On a more practical note, if you aren't one of those people with lots of big pulsing veins, try to remember where the good ones are that have worked before. Also remember, that drawing blood isn't a science so much as an art. Just because the vein looks and feels good through the skin, doesn't mean there isn't a little valve in there, that not even the best stick has a way of knowing about until they hit it with a needle, which then wont advance. Try not to get upset over one or two missed attempts.
Another thing to keep in mind is that almost everyone (probably 80%-90%) in any setting will say they are hard sticks. (Most are not.) If you mention this, consider letting the first person at least take a look anyway. Many people are told they are hard sticks (and they probably were) while dehydrated or sick in a hospital; when healthy, it is no longer the case.
Also, it is one thing to be a little nervous, but if you know you are going to shriek and yelp, hyperventilate, jerk your arm back, or otherwise cause a decent commotion, please consider
not donating blood until you can do it and remain somewhat calm. Jerking puts both you and the person drawing blood at risk of injury, and shrieking causes considerable, unnecessary anxiety in the other potential donors.
And if anyone is curious, all of the donated whole blood is separated, (mostly into platelets, plasma, leukocyte reduced compositions, and packed red cells) then distributed and billed at between $600 and $800 a unit. I have seen very sick patients who are hemorrhaging receive up to 150 units in 48 hours. This is replacing their entire blood volume approximately 10 times. Because blood is only usable for a few weeks after donation, even large hospitals only keep a few hundred units on hand. Considering types and Rh factor, it is possible for one sick patient to rapidly deplete a blood supply. Most hospitals have agreements to share blood products, but this is why blood donation can seem urgent and shortages can come on quickly and unexpectedly.
