Deal 1: 5x voted for 5D, 3x for 4D, 4x for 3D, these votes did not care about possible H fit, three "more constructive" attempts (double, 3 spades). In my opinion, the problem of 3 spade bid, for example, is that after 4 spades from RHO, one more bid (after partner's double, let us say) may look like much stronger hand than it is in reality. I bid just 3D and with partner's hand
A2---10---AJ962---AQ874
we made 5 diam +1, 5 spades contract is down two.
Main conclusion: People vote for no searching for H support. Looks reasonable since the opponents have got spade suit, anyway.
Deal 2: 9x voted for constructive 3 clubs, 4x for more aggressive 4 clubs, once (a lady!) for 5 clubs, once for 4NT. My very young and brave (and good) partner bid 5 clubs and this was the deal:
5 clubs contract was doubled and the result was -1400 (partner lost trumph control). Few times, spade slam was bid and made, but quite often, the result was diamond contract doubled down several times.
Deal 3: Absolutely clear. 15 votes for 4H. I bid 4H as well, here, I was curious, whether it is automatic bid for you, experts, or not. I can see, YES is the answer.
Deal 4: 13 votes for pass, 2 votes for 4 spades. My young partner bid 4 spades (of course

). On one side, the arguments for pass are fairly logical, however I may have a sympathy for 4S bid, since there is strong possibility, both lines have double fit hands (the 4H bid may be based on good hearts AND club support). In addition, the opponents may face real problem whether to go to the fifth level.
Anyway, from point of view of the Law, our line may correspond to the equivalent of 10 tricks (3s bid can be based on 5 cards support or there is double spade-diam fit), the opponents may have potential of 9 tricks...another reason for bidding 4S.
In reality, four hearts could have been made, four spades would have been down two, but the opponent with clubs had AKJxxxx in this suit (and Jxx in hearts) and bid 5 clubs (mistakenly, probably). This was the final contract, doubled and down one.
Deal 5: Almost all votes for pass, many objections against DONT, double come from my partner (surprisingly, I would expect him to bid AT LEAST 4D immediately), my choice would have been immediate 4D as, well. I do not think, D.O.N.T. is the problem, I like this convention, but it must be used conveniently, of course. In the real deal, 3NTshould be made just, 4D are down four, when defended carefully.