Bramall Lane's biggest crowd of the season saw United continue the unbeaten run.
Goals from Stefan Scougall and skipper Billy Sharp - his tenth of the campaign - was enough to see off MK Dons in a hard-fought encounter.
Injury forced boss Wilder into a change for the encounter with the managerless MK Dons. Done missed out with a fractured jaw, sustained at Bradford City, and Scougall started. Youngsters Whiteman and Brooks were amongst the substitutes.
United were forced to kick towards the Kop in the first half and it was a lively opening. A mix-up between Hendry and goalkeeper Martin almost presented the home side with a first-minute chance and shortly after Fleck was dispossessed and Moore had to turn a Reeves shot around a post.
Fleck was then heavily involved at the other end on five minutes as the Blades grabbed the lead. The Scotsman delivered the initial corner and then put the ball back into the danger area from the second phase for SCOUGALL to thread between a number of Dons bodies, into the net, via the back post.
After the United goal, a spell of Dons pressure failed to present them a chance on goal but their play was neat. For the Blades, Lafferty headed into the sidenetting from a deep cross by Freeman and Sharp's shot on the turn was wide.
Both teams changed their initial formations - Basham moving forward for the Blades - and although the game was even as half-time approached, the home side created more chances, including Fleck firing wide from distance.
The Dons, however, took advantage of their first opportunity of the second half to level. Bowditch and Lewington both made important contributions before POTTER sidefooted home from the edge of the box.
United hit back with a spell of pressure, including a number of set-pieces, whilst Duffy had a shot deflected wide. It took until the 64th minute before the lead was restored. From a Coutts pass, which dipped over Hendry's head, Scougall did tremendously well to keep the ball in play before feeding SHARP to score at the back post.
Lavery was introduced for the tiring Scougall soon after and the Blades looked to keep the ball for longer periods as the game became stretched. Bowditch fired over from a short corner routine for the visitors and for United, Lavery shot wide after being put through by Sharp.
Five minutes of added time saw United professionally keep the Dons at bay without threat to registered another welcome home win.
Blades: Moore, Fleck, Basham, Scougall (Lavery 73), Sharp, Wright, Coutts, Freeman, Ebanks-Landell, Duffy (O'Connell 90), Lafferty.
Unused: Ramsdale, Brown, Whiteman, Chapman, Brooks.
Dons: Martin, Baldock, Lewington, Walsh, Upson, Carruthers (Agard 28), Potter, Bowditch (Powell 79), Reeves, Hendry, Colclough (Maynard 61).
Unused: GC Williams, GB Williams, Nicholls, Downing.